Crossword Genius

Select a different instrument (7)

Ross

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" .)

I've seen this clue in The Independent.
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