Foreign street where hams are on show (8)
I believe the answer is:
broadway
'where hams are on show' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'foreign street' is the wordplay.
'foreign' becomes 'broad' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'street' becomes 'way' (road way).
'broad'+'way'='BROADWAY'
Can you help me to learn more?
(Other definitions for broadway that I've seen before include "theatrical drag" , "Manhattan street" , "Large main road" , "that took in Chicago and Oklahoma!" , "General route" .)