Blimey: duke makes connection! (4)
I believe the answer is:
cord
'connection' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'blimey duke' is the wordplay.
'blimey' becomes 'cor' (I've seen this before).
'duke' becomes 'd' (abbreviation).
'cor'+'d'='CORD'
'makes' is the link.
Can you help me to learn more?
(Other definitions for cord that I've seen before include "Small rope; flex" , "Strong string" , "Thin string" , "Small rope or thick string" , "A measure of cut wood" .)