Sign on the staff (4)

I believe the answer is:

clef

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'sign' is the definition.
(I have seen 'Sign of pitch' mean 'clef' so perhaps 'sign' could also mean 'clef')

I don't understand the remainder of the clue.

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(Other definitions for clef that I've seen before include "Musical notation on a staff" , "Item of musical notation" , "Symbol written on sheet music to indicate pitch" , "Staff symbol" , "Pitch symbol on musical stave" .)

I've seen this clue in The Globe and Mail.

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