Vessel disturbing lagoon departs (7)
I believe the answer is:
'vessel' is the definition.
(gondola is a kind of vessel)
'disturbing lagoon departs' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'departs' becomes 'd' (common abbreviation e.g. train timetables).
'lagoond' is an anagram of 'GONDOLA'.
(Other definitions for gondola that I've seen before include "Boats on the canals of Venice" , "Traditional boat of Venice" , "Palmieris' craft" , "Goon lad (anag.)" , "Venetian taxi" .)