Snack, a trifle? (7)
I believe the answer is:
peanuts
'trifle?' is the definition.
(thesaurus)
'snack a' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for peanuts that I've seen before include "Cartoon - giving a kind of butter" , "Little money" , "Cartoon strip; tiny sum" , "Insignificant amount of money for the seeds" , "bar snack" .)