Band's booking (3)
I believe the answer is:
gig
'band's booking' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gig that I've seen before include "Small horse-drawn carriage" , "A palindromic one-night performance" , "A palindromic single performance" , "A one-night entertainment" , "Live musical performance" .)