Band's kit on edge of stage (6)
I believe the answer is:
stripe
'band's' is the definition.
(synonyms)
'kit on edge of stage' is the wordplay.
'kit' becomes 'strip' (I've seen this before).
'on' says to put letters next to each other.
'edge of' says to take the final letters (one of the letters on the edge of the word).
The last letter of 'stage' is 'e'.
'strip'+'e'='STRIPE'
(Other definitions for stripe that I've seen before include "Long band of a different colour" , "Chevron on a uniform to denote military rank" , "promotion, maybe" , "Chevron indicating rank" , "Band of contrasting colour" .)