Meg returned something valuable (3)
I believe the answer is:
gem
'something valuable' is the definition.
'meg returned' is the wordplay.
'returned' is a reversal indicator.
'meg' backwards is '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)" .)