Possibly a big decision point to retire? Good (7)
I believe the answer is:
turning
'possibly a big decision point' is the definition.
(a turning point)
'retire? good' is the wordplay.
'retire?' becomes 'turnin' ('turn in' can be a synonym of 'retire').
'good' becomes 'g' (abbreviation).
'turnin'+'g'='TURNING'
'to' acts as a link.
(Other definitions for turning that I've seen before include "Changing allegiance" , "different road" , "Deviation" , "Changing direction" , "Rotating; junction" .)