Man in chinos tearing round US city (8)
I believe the answer is:
nicholas
'man' is the definition.
'chinos tearing round us city' is the wordplay.
'tearing' indicates anagramming the letters.
'round' indicates putting letters inside.
'us city' becomes 'LA' (Los Angeles).
'chinos' anagrammed gives 'nichos'.
'nichos' enclosing 'la' is 'NICHOLAS'.
'in' is the link.
(Other definitions for nicholas that I've seen before include "Patron saint of Greece (and Liverpool)" , "For man" , "Novel featuring Dotheboys Hall" , "Saint identified as Santa Claus" , "Russia's last emperor ..." .)