Perhaps time for a couple of hints: (a) an apparent anagram ‘pointer’ and nautical reference just isn’t; (b) specific knowledge helps a lot in that case, and is essential in #5 which also has a ‘sounds like’ element.
Something like, but slightly narrower - hardly representative of the East Coast as a whole I am sorry to say. But it was something of an experiment, to try this style of crossword-like clues; apologies to anyone who feels like a guinea pig and doesn't like it. On being told clues and answers, my wife (to whom my quizzing is often annoyingly obscure) did not throw up her hands in complete horror.
As to how my brain works, if it does: I am not a very frequent crossword puzzler, and have tended mainly to do that in Private Eye - though I've avoided its doubles entendres and £100 prize! Many are anagrams, so look to verbal pointers to those - though for once 'converted' in #2 is not fulfilling that role (hint: it's national ecclestiastical history). I have in #5 exploited a local Essex dialect name in the 'sounds like' clue.
I'll hold off just for a little longer but in the unlikely event that anyone is desperate, just send a PM.
Unless I am imagining it, I think Pye_End's answer (very good!) and my acknowledgement and answers have both disappeared.
Puzzling, indeed.
Ah! Apologies. It seems that they were - or ended up as - PMs. Whether I did not realise his was a PM and something happened automatically or I somehow clicked the wrong button I do not know.
OK - it was a PM, so apologies all round for my forum fumbling.
Season ‘laidoff’ so may not be passing this for a while. (4, 6) Osea Island
One follows a converted Victorian Cardinal - but it may mean a place that had many (11)
Manning (Henry Edward Manning - Wikipedia) + tree; possible placename origin 'Many trees' so: Manningtree Worriedwife extols a sharp lookout when passing here. (10) Felixstowe
The top ‘Beak’ perhaps? (5, 4)
'Beak' is slang for magistrate, so: Bench Head
Popularly, perhaps, the place to take one step up from the snuggest garment? (2, 5)
Onesie, Toosey - so: St Osyth Singled by fate, confused, he goes aground here. (6, 5)
The 'by' is perhaps (?) a bit naughty in the middle of the anagram, but you did have the character count. Dengie Flats
Felicitations again to Pye_End, and thanks - or apologies if necessary - to all who had a go.