Approach game with reversed wordplay (3-2)
I believe the answer is:
run-up
'approach' is the definition.
(I know that run-up is a type of approach)
'game with reversed wordplay' is the wordplay.
'game' becomes 'RU' (rugby union).
'with' is a charade indicator (letters next to each other).
'reversed' says the letters should be written backwards.
'wordplay' becomes 'pun' (synonyms).
'pun' written backwards gives 'nup'.
'ru'+'nup'='RUN-UP'
(Other definitions for run-up that I've seen before include "Bowler's approach?" , "Cricketing approach?" , "Approach - preliminaries" , "Preliminary period" .)