Too high a price to pay for love (4)
I believe the answer is:
dear
I believe this clue is a double definition.
'too high a price to pay for' is the first definition.
'love' is the second definition.
(I know that love can be written as dear)
(Other definitions for dear that I've seen before include "Beloved - expensive" , "Expensive; sweet" , "It's not cheap" , "Baby" , "Expensive or loved" .)