Meg returns something valuable (3)
I believe the answer is:
gem
'something valuable' is the definition.
'meg returns' is the wordplay.
'returns' is a reversal indicator.
'meg' in reverse letter order is 'GEM'.
(Other definitions for gem that I've seen before include "Valued person; jewel" , "Setter might bed this" , "36 Across or any other jewel" , "A jewel or precious stone" , "one of the Cairngorms?" .)