Firm can set out to limit debt (9)
I believe the answer is:
tenacious
'firm' is the definition.
(thesaurus)
'can set out to limit debt' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'to limit' indicates putting letters inside.
'debt' becomes 'iou'.
'can'+'set'='canset'
'canset' anagrammed gives 'tenacs'.
'tenacs' placed around 'iou' is 'TENACIOUS'.
(Other definitions for tenacious that I've seen before include "Persevering" , "Keeping a firm hold" , "Persistent in holding on" , "Holding or sticking firmly" , "Dogged" .)