Be inclined to stifle Republican's rage (5)
I believe the answer is:
trend
'rage' is the definition.
(thesaurus)
'be inclined to stifle republican's' is the wordplay.
'be inclined' becomes 'tend' (synonyms).
'to stifle' is an insertion indicator.
'republican' becomes 'r' (abbreviation).
'tend' placed around 'r' is 'TREND'.
(Other definitions for trend that I've seen before include "Fashion; general drift" , "General direction of movement" , "Prevailing direction" , "turn" , "Current fashion" .)