One who considers ditching husband for potter (6)
I believe the answer is:
tinker
'potter' is the definition.
('tinker' can be a synonym of 'potter')
'one who considers ditching husband' is the wordplay.
'one who considers' becomes 'thinker'.
'ditching' suggests deleting specific letters.
'husband' becomes 'h'.
'thinker' with 'h' taken out is 'TINKER'.
'for' is the link.
(Other definitions for tinker that I've seen before include "Make trivial adjustments - itinerant tradesman" , "Itinerant pot mender" , "Mender of pots and pans" , "Work aimlessly, at repairs say" , "Mess around with" .)