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Geek abruptly, after blocking pieces, mates (8)

Ross

I believe the answer is:

partners

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for partners that I've seen before include "Business or marital mates" , "Close associates in business or life" , "Companions or associates" , "They share in an activity, business or marriage" .)

I've seen this clue in The Times and The Sunday Times.
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