Select a different instrument (7)
I believe the answer is:
celesta
'instrument' is the definition.
(celesta is a kind of instrument)
'select a different' is the wordplay.
'different' is an anagram indicator.
'select'+'a'='selecta'
'selecta' with letters rearranged gives 'CELESTA'.
(Other definitions for celesta that I've seen before include "one giving out notes" , "Keyboard percussion instrument giving a bell-like sound" , "Musical instrument" , "a bunch of keys?" , "Play this" .)