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4 Across, Moribund animal beginning to needle busy little one (8)

9 Across, Outer protective covering is said to suit this ship (6)

10 Across, Collar has solitary mark on the outside (4,4)

11 Across, Canon has accident making journey (5,4)

Compiler - QUIXOTE

Many Thanks

9a barque ( small ship)... sounds like bark

4a: stagnant= moribund (def)
stag - animal
n - n (eedle)
ant - busy little one

10 polo neck
lone in pock

11a round trip (journey)
canon - round
accident - trip

https://simple.m.wikipedia.org/wiki/Canon_(music)

Good morning and many thanks to all.

Glad to help, John

I'm stuck in the SE. Possibly help with one will clear the rest!

There's sign of heat around one (not consuming oxygen) (8)

?I???E?? (4th letter might be A)

Filament

i in flame + n(o)t