Put right or smooth over (4,3)
I believe the answer is:
iron out
This clue is a double definition.
'put right' is the first definition.
(synonyms)
'smooth over' is the second definition.
(I've seen this in another clue)
(Other definitions for iron out that I've seen before include "Clear up (wrinkles in clothes or agreement)" , "Settle, put right" , "Smooth, clear up" , "ready to make approach?" , "Settle (problems)" .)