Flowerlike sea creature (7)
I believe the answer is:
anemone
'flowerlike sea creature' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for anemone that I've seen before include "Plant with brightly coloured flowers - found also in sea" , "Plant of the buttercup family - one name (anag)" , "Pretty flower or sea animal" , "Plant of the buttercup family with brightly coloured flowers" , "Windflower - sea creature" .)