Go round the bend, or get better? (4,3,6)
I believe the answer is:
turn the corner
'get better?' is the definition.
'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 "What driver at T-junction might do next" , "Start to improve" , "Pass a critical point and improve" , "Begin to get better" , "Get past the worst" .)