State of king meeting an elite army unit (6)
I believe the answer is:
kansas
'state' is the definition.
(Kansas is an example)
'king meeting an elite army unit' is the wordplay.
'king' becomes 'k' (abbreviation for king in chess).
'meeting' says to put letters next to each other.
'elite army unit' becomes 'SAS' (short for Special Air Service).
'k'+'an'+'sas'='KANSAS'
'of' is the link.
(Other definitions for kansas that I've seen before include "State of central USA" , "Where Dorothy and Toto lived with Aunt Em" , "American state, capital Topeka" , "Midwestern US state" , "State north of Oklahoma" .)