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Setting for grinder you picked up (6)

Ross

I believe the answer is:

milieu

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'setting' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for milieu that I've seen before include "(Social) setting" , "Surroundings - location" , "Social environment or set of surroundings" , "'Surroundings, setting (6)'" , "Environment - setting" .)

I've seen this clue in The Irish Times.
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