Lets go of instrument in recital (5)
I believe the answer is:
sacks
'lets go of' is the definition.
(let go of can mean to dismiss or sack)
'instrument in recital' is the wordplay.
'instrument' becomes 'sax' (saxophone).
'in recital' indicates a 'sounds like' (homophone) clue.
'sax' sounds like 'SACKS'.
(Other definitions for sacks that I've seen before include "sends up in flames" , "Gets rid of" , "Raids; boots out" , "Cashiers" , "Discharges" .)