Room at inn organised for one proposing candidate (9)
I believe the answer is:
nominator
'one proposing candidate' is the definition.
(I've seen this before)
'room at inn organised' is the wordplay.
'organised' indicates an anagram.
'room'+'at'+'inn'='roomatinn'
'roomatinn' anagrammed gives 'NOMINATOR'.
'for' acts as a link.
(Other definitions for nominator that I've seen before include "The proposer" , "someone who makes proposal" , "One who proposes" , "One who puts forward a candidate for election" , "One proposing candidate" .)