Organise a gay reel with zest (7)
I believe the answer is:
eagerly
'with zest' is the definition.
(thesaurus)
'organise a gay reel' is the wordplay.
'organise' is an anagram indicator (I've seen 'organised' mean this).
'gay'+'reel'='gayreel'
'gayreel' with letters rearranged gives 'EAGERLY'.
(Other definitions for eagerly that I've seen before include "In a keen manner" , "Fervently" , "With enthusiasm" , "Showing impatience" , "With hunger" .)