Dash of fishing vessel? (5)
I believe the answer is:
smack
This clue is a double definition.
'dash' is the first definition.
(thesaurus)
'fishing vessel?' is the second definition.
(I've seen this in another clue)
'of' is the link.
(Other definitions for smack that I've seen before include "Hit - kiss - fishing boat - heroin" , "Sharp taste" , "Hit - drug" , "Slap; single-masted boat" , "Distinctive trace" .)