After retirement I see a way of working in US city (5)
I believe the answer is:
omaha
'us city' is the definition.
(I've seen this before)
'after retirement i see a way of working' is the wordplay.
'after retirement' is a reversal indicator.
'i see' becomes 'aha' (both are said after realising something).
'a way of working' becomes 'mo' (abbreviation for modus operandi).
'aha'+'mo'='ahamo'
'ahamo' back-to-front is 'OMAHA'.
'in' acts as a link.
(Other definitions for omaha that I've seen before include "This was old Indian territory" , "O, a ham found in US city on Missouri river" , "- - Beach (WWII)" , "Nebraska city and code-named beach of D-Day landings" , "American-Indians" .)