Make good journey in single attempt (2,3,2)
I believe the answer is:
at one go
'single attempt' is the definition.
(I've seen this before)
'make good journey' is the wordplay.
'make good' becomes 'atone' (I've seen this before).
'journey' becomes 'go' (I've seen this in other clues).
'atone'+'go'='AT ONE GO'
'in' acts as a link.
(Other definitions for at one go that I've seen before include "simultaneously" , "In a single attempt or visit" , "First time" .)