Judge a Republican, one using teeth (7)

I believe the answer is:

arbiter

'judge' is the definition.
(I know that arbiter is a type of judge)

'a republican one using teeth' is the wordplay.
'republican' becomes 'r' (abbreviation).
'one using teeth' becomes 'biter' (I've seen this before).
'a'+'r'+'biter'='ARBITER'

(Other definitions for arbiter that I've seen before include "One settling disputes" , "He'll decide" , "Rear bit (anag.)" , "One decides in disputes" , "Judge, umpire" .)

I've seen this clue in The Sun.

Want a hint initially instead of a full solution? Install my app