Credit with being back in a set-up minimally difficult (6)
I believe the answer is:
impute
'credit' is the definition.
(I know that credit is a is a more specific form of the action impute)
'being back in a set-up minimally difficult' is the wordplay.
'being back' says the letters should be written backwards.
'in' says the answer is hidden in the clue.
'etupmi' is hidden within 'set up minimally difficult'.
'etupmi' backwards is 'IMPUTE'.
'with' is the link.
(Other definitions for impute that I've seen before include "Attribute or ascribe - say fault" , "reckon" , "take into account" , "Ascribe (something unpleasant)" , "Ascribe (crime etc) to someone" .)