Fellow in sparkling entertainment (4)
I believe the answer is:
gent
'fellow' is the definition.
(synonyms)
'in sparkling entertainment' is the wordplay.
'in' indicates a hidden word.
'GENT' can be found hidden inside 'sparkling entertainment'.
(Other definitions for gent that I've seen before include "Honourable man" , "Auctioneer's tool" , "cove" , "Refined man (colloquial)" , "Man of good standing (informal)" .)