Crossword Genius

Contact group of spies (see above) (4)

Ross

I believe the answer is:

ring

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'contact' is the definition.
(to contact by phone)

I don't understand the remainder of the clue.

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(Other definitions for ring that I've seen before include "Chime" , "Hoop" , "Call; circle" , "something at the jewellery shop?" , "resonant sound" .)

I've seen this clue in The Guardian.
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