Lancashire town seen in north after quick movement (7)
I believe the answer is:
preston
'lancashire town' is the definition.
(I've seen this before)
'north after quick movement' is the wordplay.
'north' becomes 'N' (abbreviation).
'after' means one lot of letters go next to another.
'quick movement' becomes 'presto' (I've seen this in another clue).
'n' after 'presto' is 'PRESTON'.
'seen in' acts as a link.
(Other definitions for preston that I've seen before include "Administrative centre of Lancashire" , "Town in Lancashire" , "Town on the Ribble" , "city (as of 2002)" , "English city" .)