Crossword Genius

Staff could have this small volume, mostly untouched (1,4)

Ross

I believe the answer is:

c clef

'staff could have this' is the definition.
(C clefs are used in sheet music)

'small volume mostly untouched' is the wordplay.
'small volume' becomes 'cc' (cubic centimetre).
'mostly' means to remove the last letter.
'untouched' becomes 'left'.
'left' with its last letter taken away is 'lef'.
'cc'+'lef'='C CLEF'

I've seen this clue in The Times.
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