A returned lottery prize (5)
I believe the answer is:
award
'prize' is the definition.
(I know that prize can be written as award)
'a returned lottery' is the wordplay.
'returned' is a reversal indicator.
'lottery' becomes 'draw' (I've seen this in other clues).
'draw' reversed gives 'ward'.
'a'+'ward'='AWARD'
(Other definitions for award that I've seen before include "Present - prize" , "E.g. Oscar" , "settlement" , "Tony, say" , "Grant made by a court of law" .)