Crossword Genius

Trimmed round the edge (3)

Ross

I think it could be either:

cut

rim

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But I've got no explanation for this one! Could you help me understand?

(Other definitions for rim that I've seen before include "Circumference" , "Raised edge of a round object" , "Edge - lip" , "Top edge" , "Edge, border" .)

I've seen this clue in The Mirror.
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