Control bad credit (6)
I believe the answer is:
direct
'control' is the definition.
(directing is a kind of controlling)
'bad credit' is the wordplay.
'bad' is an anagram indicator.
'credit' anagrammed gives 'DIRECT'.
(Other definitions for direct that I've seen before include "Guides do it" , "Straight; manage" , "the shortest way" , "Point the way" , "Straightforward; control" .)