Meg returned a stone (3)

I believe the answer is:

gem

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

'meg returned' is the wordplay.
'returned' shows that the letters should be reversed in order.
'meg' backwards is 'GEM'.

(Other definitions for gem that I've seen before include "36 Across or any other jewel" , "Setter might bed this" , "Kindness; comfort (German)" , "Treasured person" , "Valuable stone" .)

I've seen this clue in The Mirror.

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