Get fifty in team for easy victory (9)
I believe the answer is:
landslide
'easy victory' is the definition.
(I've seen this before)
'get fifty in team' is the wordplay.
'get' becomes 'land' (landing is a kind of getting).
'fifty' becomes 'L' (Roman numeral).
'in' is an insertion indicator.
'team' becomes 'side' (both can mean a sports team).
'l' put inside 'side' is 'slide'.
'land'+'slide'='LANDSLIDE'
'for' acts as a link.
(Other definitions for landslide that I've seen before include "Overwhelming victory in election, or a natural disaster" , "great electoral success" , "big majority" , "easy victory" , "Shifting of ground" .)