Type of person to credit with nothing good (5)
I believe the answer is:
crook
'type of person' is the definition.
'credit with nothing good' is the wordplay.
'credit' becomes 'cr'.
'with nothing' becomes 'o' (I've seen this in other clues).
'good' becomes 'ok'.
'cr'+'o'+'ok'='CROOK'
'to' acts as a link.
(Other definitions for crook that I've seen before include "Something kinky" , "Hooked staff" , "Professional criminal" , "Well, no" , "Fence, perhaps" .)