Meg returned jewel (3)
I believe the answer is:
gem
'jewel' is the definition.
('gem' can be a synonym of 'jewel')
'meg returned' is the wordplay.
'returned' says the letters should be written in reverse.
'meg' backwards is 'GEM'.
(Other definitions for gem that I've seen before include "Kindness; comfort (German)" , "Pleasant and cheerful (from German)" , "Diamond, ruby, or emerald" , "Pearl" , "Valued person; jewel" .)