Overly long extract sounds like nothing up north (5,3)
I believe the answer is:
drawn out
'overly long' is the definition.
(going on for too long)
'extract sounds like nothing up north' is the wordplay.
'extract' becomes 'draw' (I've seen this before).
'sounds like' shows a homophone (sound like).
'nothing up north' becomes 'nowt' ('nothing' in Northern English dialects).
'nowt' is a homophone of 'nout'.
'draw'+'nout'='DRAWN-OUT'
(Other definitions for drawn out that I've seen before include "Lengthy" , "Extended" , "encouraged to talk at length" , "open-air sketch might have been" , "too long" .)