Tales about a bargain (5)
I believe the answer is:
steal
'a bargain' is the definition.
('steal' can be a synonym of 'bargain')
'tales about' is the wordplay.
'about' is an anagram indicator.
'tales' is an anagram of 'STEAL'.
(Other definitions for steal that I've seen before include "pirate" , "Filch" , "Creep" , "bargain?" , "Whip" .)