Deception involving northern band (4)
I believe the answer is:
line
'band' is the definition.
(band can mean a strip or line)
'deception involving northern' is the wordplay.
'deception' becomes 'lie' (I've seen this in other clues).
'involving' means one lot of letters goes inside another.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'lie' enclosing 'n' is 'LINE'.
(Other definitions for line that I've seen before include "Ancestry" , "It's long relative to its width" , "Railway track; wrinkle" , "short note" , "(Skin) wrinkle; limit" .)