Go round the bend or start to improve? (4,3,6)
I believe the answer is:
turn the corner
'start to improve?' is the definition.
(I've seen this before)
'go round the bend' is the wordplay.
'go round' becomes 'turn' (both can mean to rotate).
'bend' becomes 'corner' (I've seen this before).
'turn'+'the'+'corner'='TURN THE CORNER'
'or' acts as a link.
(Other definitions for turn the corner that I've seen before include "Start to improve" , "Get past the worst" , "Pass a critical point and improve" , "Begin to get better" , "What driver at T-junction might do next" .)