Charge makes a lot of sense (3)
I believe the answer is:
fee
'charge' is the definition.
(I know that fee is a type of fixed cost)
'a lot of sense' is the wordplay.
'a lot of' means to remove the last letter (most of the word but not all of it).
'sense' becomes 'feel' (synonyms).
'feel' with its last letter taken away is 'FEE'.
'makes' is the link.
(Other definitions for fee that I've seen before include "Sum payable to, say, barrister" , "Cost" , "Payment to a professional for services" , "Money paid for professional services" , "Sum payable to professional person for services" .)