Sloth in Leeds North is rampant (8)
I believe the answer is:
idleness
'sloth' is the definition.
(I've seen this before)
'leeds north is rampant' is the wordplay.
'north' becomes 'N' (abbreviation).
'rampant' indicates anagramming the letters (I've seen this in other clues).
'leeds'+'n'+'is'='leedsnis'
'leedsnis' with letters rearranged gives 'IDLENESS'.
'in' is the link.
(Other definitions for idleness that I've seen before include "Lack of activity" , "Disinclination to work" , "Inertia" , "Having a loaf" , "I'm having nothing to do" .)