Procession over, over for the King (7)
I believe the answer is:
monarch
'the king' is the definition.
(I've seen this before)
'procession over over' is the wordplay.
'procession' becomes 'march' (march is a kind of procession).
'over' indicates putting letters inside.
'over' becomes 'on' (physically on top of).
'march' enclosing 'on' is 'MONARCH'.
'for' is the link.
(Other definitions for monarch that I've seen before include "Crowned head" , "Head of State" , "Butterfly (emperor, say?)" , "Sole hereditary ruler" , "King or butterfly" .)