Price upset Scot (4)
I believe the answer is:
cost
'price' is the definition.
(I know that price can be written as cost)
'upset scot' is the wordplay.
'upset' indicates anagramming the letters.
'scot' is an anagram of 'COST'.
(Other definitions for cost that I've seen before include "Amount to pay" , "Suffering" , "Charge" , "Amount required as payment" , "Fee" .)