Slaps the fishing vessels? (6)
I believe the answer is:
smacks
'slaps the fishing vessels?' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for smacks that I've seen before include "big kisses" , "Smells; fishing boats" , "Fishing ships with sails" , "Boxes" , "Loud slaps for fishing vessels" .)