Meg returned something valuable (3)

I believe the answer is:

gem

'something valuable' is the definition.

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

(Other definitions for gem that I've seen before include "Diamond, ruby, or emerald" , "Pleasant and cheerful (from German)" , "36 Across or any other jewel" , "A jewel or precious stone" , "Kindness; comfort (German)" .)

I've seen this clue in The Mirror.

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