Meg returned something valuable (3)
I believe the answer is:
gem
'something valuable' is the definition.
'meg returned' is the wordplay.
'returned' says the letters should be written in reverse.
'meg' in reverse letter order 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)" .)