Cream with fewer calories on last of trifle (5)
I believe the answer is:
elite
'cream' is the definition.
(thesaurus)
'with fewer calories on last of trifle' is the wordplay.
'with fewer calories' becomes 'lite' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'last of' suggests the final letters.
The final letter of 'trifle' is 'e'.
'lite' put after 'e' is 'ELITE'.
(Other definitions for elite that I've seen before include "Aristocratic" , "A privileged or superior social group" , "Privileged or posh group" , "top drawer?" , "Best, privileged, group" .)