Arrange a gay reel with zest (7)
I believe the answer is:
eagerly
'with zest' is the definition.
(thesaurus)
'arrange a gay reel' is the wordplay.
'arrange' is an anagram indicator.
'gay'+'reel'='gayreel'
'gayreel' is an anagram of 'EAGERLY'.
(Other definitions for eagerly that I've seen before include "With keen anticipation" , "In a keen manner" , "Ardently and avidly" , "With hunger" , "anxiously" .)