Old male I see in Nebraskan city (5)
I believe the answer is:
omaha
'nebraskan city' is the definition.
(I've seen this in another clue)
'old male i see' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'male' becomes 'm' (common abbreviation).
'i see' becomes 'aha' (both are said after realising something).
'o'+'m'+'aha'='OMAHA'
'in' acts as a link.
(Other definitions for omaha that I've seen before include "Cotton fabric used for curtains and upholstery" , "American Indian" , "O, a ham found in US city on Missouri river" , "American-Indians" , "Largest city in Nebraska" .)