Time to plunder pudding? (6)
I believe the answer is:
trifle
'pudding?' is the definition.
(I've seen this before)
'time to plunder' is the wordplay.
'time' becomes 't' (abbreviation).
'to plunder' becomes 'rifle' ('rifle' can be a synonym of 'plunder').
't'+'rifle'='TRIFLE'
(Other definitions for trifle that I've seen before include "Amuse oneself" , "Filter (anag.)" , "Cold dessert" , "A desert of no importance" , "Toy; a sweet" .)