Sea snail (5)

I believe the answer is:
whelk
'sea snail' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for whelk that I've seen before include "Edible marine snail" , "Marine gastropod mollusc" , "Edible mollusc" , "Spiral-shelled mollusc" , "Mollusc with pointed shell" .)