Band on road finds old port (4)
I believe the answer is:
tyre
This might be a double definition.
'band on road' is the first definition.
'tyre' can be an answer for 'band' (tyre is a kind of band). I'm not sure about the 'on road' bit.
'old port' is the second definition.
(I've seen this before)
'finds' is the link.
Can you help me to learn more?
(Other definitions for tyre that I've seen before include "Lebanese port - wheel surround" , "Rubber wheel-ring" , "Ancient city (made of rubber?)" , "Pneumatic wheel cover" , "Rubber ring on a wheel" .)