One provoking quote penned by Indiana Republican (7)
I believe the answer is:
inciter
'indiana republican' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'one provoking quote penned by' is the wordplay.
'one' becomes 'i' (Roman numeral).
'provoking' becomes 'nr' (I am not sure about this - if you are sure you should believe this answer much more).
'quote' becomes 'cite' ('cite' can be a synonym of 'quote').
'penned by' indicates putting letters inside.
'nr' placed around 'cite' is 'nciter'.
'i'+'nciter'='INCITER'
Can you help me to learn more?
(Other definitions for inciter that I've seen before include "instigator of action" , "provoking fellow" , "who might supply Spark?" , "He encourages" .)