A high city thoroughfare, say, winding around (7)
I believe the answer is:
ecstasy
'a high' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'city thoroughfare say winding around' is the wordplay.
'city' becomes 'EC' (the City of London postcode).
'thoroughfare' becomes 'st' (I've seen this in other clues).
'winding' is an anagram indicator.
'around' is an insertion indicator.
'say' with letters rearranged gives 'asy'.
'st' inserted within 'asy' is 'stasy'.
'ec'+'stasy'='ECSTASY'
Can you help me to learn more?
(Other definitions for ecstasy that I've seen before include "Great delight" , "State of perfect bliss" , "State of rapture" , "Street name for the MDMA drug" , "State of euphoria and drug that induces it" .)