Two cities introducing a way to produce cord (7)
I believe the answer is:
lanyard
'cord' is the definition.
(I know that lanyard is a type of cord)
'two cities introducing a way' is the wordplay.
'two cities' can mean two substitutions for 'city'.
'city' becomes 'LA' (Los Angeles).
'city' becomes 'ny' (short for New York).
'introducing' says to put letters next to each other (some letters go before others).
'way' becomes 'rd' (short for road).
'la'+'ny'+'a'+'rd'='LANYARD'
'to produce' acts as a link.
(Other definitions for lanyard that I've seen before include "Neck cord holding whistle" , "Short rope used as a fastening" , "Nautical rope" , "Cord with whistle attached" , "Rope on ship's rigging" .)