Hourly charge (4)
I believe the answer is:
rate
'hourly charge' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rate that I've seen before include "Assess the value of" , "Think highly of - price" , "Be worthy of; speed" , "Price - class - speed" , "Tear (anag.)" .)