Crossword Genius

So a girl can play musical instrument! (3,7)

Ross

I believe the answer is:

cor anglais

'musical instrument' is the definition.
(cor anglais is a kind of musical instrument)

'so a girl can play' is the wordplay.
'play' indicates anagramming the letters.
'so'+'a'+'girl'+'can'='soagirlcan'
'soagirlcan' with letters rearranged gives 'COR ANGLAIS'.

(Other definitions for cor anglais that I've seen before include "Woodwind instrument" , "alto member of family" , "horn?" , "MUSICAL INSTRUMENT" , "Orchestra member rarely" .)

I've seen this clue in The Guardian.
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