Band from north in fix (4)
I believe the answer is:
ring
'band' is the definition.
(a ring is a band of metal)
'north in fix' is the wordplay.
'north' becomes 'N' (abbreviation).
'in' is an insertion indicator.
'fix' becomes 'rig' (rigging is a kind of fixing).
'n' placed within 'rig' is 'RING'.
'from' acts as a link.
(Other definitions for ring that I've seen before include "Circle; telephone" , "Call - cartel" , "sign of union?" , "Frodo's burden (Tolkien)" , "Group of criminals maybe" .)