After month barely, husband and wife separate (8)
I believe the answer is:
uncouple
'separate' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for uncouple that I've seen before include "Detach one train carriage from another" , "Release" , "Disconnect" , "Detach (a railway carriage)" , "Detach (truck from train)" .)