Official witness to any Republican dodges (6)
I believe the answer is:
notary
'official witness' is the definition.
(I've seen this in another clue)
'to any republican dodges' is the wordplay.
'republican' becomes 'R' (abbreviation in US politics).
'dodges' indicates an anagram (I've seen 'dodged' mean this).
'to'+'any'+'r'='toanyr'
'toanyr' anagrammed gives 'NOTARY'.
(Other definitions for notary that I've seen before include "legal worker" , "Public official, usually a solicitor" , "One drawing up legal documents" , "Person authorised to witness signatures, etc" , "Person who may certify legal documents" .)