Fights over one bill where alcohol's served (4,4)

'alcohol's served' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'fights over one bill' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'bill' could be 'neb' (synonyms) and 'neb' is located in the answer.
'fights' could be 'wars' (warring is a kind of fighting) and 'wars' is found in the remaining letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).

'where' acts as a link.

Can you help me to learn more?