Excess amount: agreed it should cover fine (7)
I believe the answer is:
surfeit
'excess' is the definition.
(synonyms)
'agreed it should cover fine' is the wordplay.
'agreed' becomes 'sure' (I've seen this before).
'should cover' means one lot of letters goes inside another.
'fine' becomes 'f' (abbreviation e.g. condition of old coins, books).
'sure'+'it'='sureit'
'sureit' going around 'f' is 'SURFEIT'.
'amount' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for surfeit that I've seen before include "stuff, once" , "having had quite enough" , "Fustier (anag)" , "excessive amount" , "Overindulgence" .)