Showy American street (8)
I believe the answer is:
broadway
'showy american street' is the definition.
'Broadway' can be an answer for 'street' (Broadway is an example). I'm not certain of the 'showy american' bit.
'american street' is the wordplay.
'american' becomes 'broad' (I can't justify this - if you can 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 "New York's theatreland" , "New York Theaterland" , "where shows are staged" , "Theatre district in New York" , "New York's theatre centre" .)