Procession Democrat organised round Ohio's capital (9)
I believe the answer is:
motorcade
'procession' is the definition.
(motorcade is a kind of procession)
'democrat organised round ohio's capital' is the wordplay.
'organised' indicates anagramming the letters.
'round' is an insertion indicator.
'capital' indicates taking the first letters.
The initial letter of 'ohio' is 'o'.
'democrat' is an anagram of 'motrcade'.
'motrcade' placed around 'o' is 'MOTORCADE'.
(Other definitions for motorcade that I've seen before include "Procession using cars" , "vehicular procession" , "Procession of cars bringing VIP" , "Maybe Kennedy's entourage" , "Line of cars escorting a dignitary" .)