A banker's worried, in a state (8)
I believe the answer is:
nebraska
'in a state' is the definition.
(I've seen this before)
'a banker's worried' is the wordplay.
'worried' indicates an anagram.
'a'+'bankers'='abankers'
'abankers' with letters rearranged gives 'NEBRASKA'.
(Other definitions for nebraska that I've seen before include "State of the western US" , "Cornhusker State" , "Where Lincoln found" , "Mid-western US state" , "State of central US" .)