Call up First Lady about Oklahoma (5)
I believe the answer is:
evoke
'call up' is the definition.
(synonyms)
'first lady about oklahoma' is the wordplay.
'first lady' becomes 'eve' (first woman in the Bible).
'about' means one lot of letters goes inside another.
'oklahoma' becomes 'ok' (abbreviation for the US state).
'eve' enclosing 'ok' is 'EVOKE'.
(Other definitions for evoke that I've seen before include "Bring (a thing) to mind" , "Elicit (a response)" , "Rekindle" , "Raise" , "call-up" .)