Bill enters inn, rolling over in northern town (5)
I believe the answer is:
bacup
'in northern town' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'bill enters inn rolling' is the wordplay.
'bill' becomes 'ac' (abbreviation for account).
'enters' indicates putting letters inside.
'inn' becomes 'pub' (both can mean a drinking establishment).
'rolling' is a reversal indicator.
'pub' reversed gives 'bup'.
'ac' going inside 'bup' is 'BACUP'.
'over' is the link.
Can you help me to learn more?
(Another definition for bacup that I've seen is " Lancashire town".)