Crossword Genius

School gets a ten for instrument (3)

Ross

I believe the answer is:

sax

'for instrument' is the definition.
(saxophone)

'school gets a ten' is the wordplay.
'school' becomes 'S'.
'gets' says to put letters next to each other.
'ten' becomes 'X' (Roman numeral).
's'+'a'+'x'='SAX'

(Other definitions for sax that I've seen before include "Music-maker" , "Jazz instrument (abbr)" , "Wind instrument (abbr)" .)

I've seen this clue in The Mirror.
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