Tear off price (4)
I believe the answer is:
rate
'price' is the definition.
(I know that rate is a type of price)
'tear off' is the wordplay.
'off' is an anagram indicator.
'tear' anagrammed gives 'RATE'.
(Other definitions for rate that I've seen before include "Assign a value to something" , "Grade or evaluate" , "Tear up in tempo" , "Cost" , "Find fault with - speed - charge" .)