Exhausted Republican breaks habit with barbarian spree (4,2,1,7)

I believe the answer is:
worn to a frazzle
'exhausted' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'republican breaks habit with barbarian spree' is the wordplay.
'republican breaks habit' becomes 'wornt' (I am not sure about this - if you are sure you should believe this answer much more).
'with' is a charade indicator (letters next to each other).
'barbarian' becomes 'oaf' (I've seen this before).
'spree' becomes 'razzle' (I have seen 'Rowdy spree ' mean 'razzle' so perhaps 'spree' could also mean 'razzle').
'wornt'+'oaf'+'razzle'='WORN TO A FRAZZLE'
Can you help me to learn more?
