A story about car not breaking the bank (10)
I believe the answer is:
affordable
'not breaking the bank' is the definition.
(I've seen this before)
'a story about car' is the wordplay.
'story' becomes 'fable' (fable is a kind of story).
'about' indicates putting letters inside.
'car' becomes 'ford' (Ford is a make of car).
'fable' enclosing 'ford' is 'ffordable'.
'a'+'ffordable'='AFFORDABLE'
(Other definitions for affordable that I've seen before include "costing reasonable amount" , "sustainable" , "Within one's ability to pay" , "being within one's means" , "not breaking the bank" .)