As one born in Lancashire town to the north (2,4)
I believe the answer is:
en bloc
'as one' is the definition.
(French phrase meaning altogether)
'born in lancashire town to the north' is the wordplay.
'born' becomes 'b'.
'in' means one lot of letters goes inside another.
'lancashire town' becomes 'colne'.
'to the north' says the letters should be written in reverse.
'b' put within 'colne' is 'colbne'.
'colbne' back-to-front is 'EN BLOC'.
(Other definitions for en bloc that I've seen before include "in wholesale fashion" , "Wholesale, as one unit" , "As a group (French)" , "All together (French)" , "As a group (Fr.)" .)