Go away for trial (3,3)
I believe the answer is:
try out
'trial' is the definition.
'go away' is the wordplay.
'go' becomes 'try' (I've seen this before**).
'away' becomes 'out' ('out' can be a synonym of 'away').
'try'+'out'='TRY-OUT'
'for' is the link.
(Other definitions for try out that I've seen before include "Sample" , "Taste" , "Put to experimental use" , "Test and evaluate" .)