New boats need time to wreck (8)
I believe the answer is:
sabotage
'to wreck' is the definition.
(I've seen this before)
'new boats need time' is the wordplay.
'new' indicates an anagram.
'need' is a charade indicator (letters next to each other).
'time' becomes 'age' (an age is a period of time).
'boats' is an anagram of 'sabot'.
'sabot'+'age'='SABOTAGE'
(Other definitions for sabotage that I've seen before include "Treachery!" , "Scupper" , "cripple" , "Vandalism" , "Subvert" .)