Smack in Staffordshire town changing hands (4)
I believe the answer is:
reek
'smack' is the definition.
(both can mean to smell)
I don't understand how the remainder of the clue works.
(Other definitions for reek that I've seen before include "Smell, like a Kerry mountain?" , "Smell bad" , "Effluvium" , "bad odour" , "Smell badly" .)