I'm not obliged, but try to leave the cost, generally (7)
I believe the answer is:
ingrate
'cost generally' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ingrate that I've seen before include "One unappreciative" , "Thankless sort" , "He doesn't appreciate" , "Unappreciative character" , "one offers no thanks" .)