Cruise soon spoiled by fault-finding (10)
I believe the answer is:
censorious
'fault-finding' is the definition.
(I've seen this before)
'cruise soon spoiled' is the wordplay.
'spoiled' indicates an anagram.
'cruise'+'soon'='cruisesoon'
'cruisesoon' anagrammed gives 'CENSORIOUS'.
'by' acts as a link.
(Other definitions for censorious that I've seen before include "making moral judgments?" , "Fault-finding" , "Blaming" , "Severely critical" .)