Crossword Genius

Concessions for high voices? (4)

Ross

I believe the answer is:

sops

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'concessions' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for sops that I've seen is " Food softened in liquid - inadequate concessions".)

I've seen this clue in The Times.
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