Stars sent bananas during light meal (13)
I believe the answer is:
constellation
'stars' is the definition.
(thesaurus)
'sent bananas during light meal' is the wordplay.
'bananas' indicates an anagram (informal term for mad).
'during' indicates putting letters inside.
'light meal' becomes 'collation' (collation can mean a light meal).
'sent' with letters rearranged gives 'nste'.
'nste' put within 'collation' is 'CONSTELLATION'.
(Other definitions for constellation that I've seen before include "Group of stars" , "E.g Orion, Andromeda" , "Formation of stars" , "Twenty-five across for instance" , "Client to salon (anag.)" .)