First back gets the trophy (3)
I believe the answer is:
pot
'the trophy' is the definition.
(thesaurus)
'first back' is the wordplay.
'first' becomes 'top' ('top' can be a synonym of 'first').
'back' is a reversal indicator.
'top' written backwards gives 'POT'.
'gets' acts as a link.
(Other definitions for pot that I've seen before include "Plant holder" , "Trophy; kitty" , "Slangy cannabis" , "Grass" , "prize" .)