Modern day ballot accepting accountant and lawyer (8)
I believe the answer is:
advocate
'lawyer' is the definition.
(I've seen this before)
'modern day ballot accepting accountant' is the wordplay.
'modern day' becomes 'ad' (I've seen this in other clues).
'ballot' becomes 'vote' ('vote' can be a synonym of 'ballot').
'accepting' is an insertion indicator.
'accountant' becomes 'ca' (abbreviation for chartered accountant).
'vote' enclosing 'ca' is 'vocate'.
'ad'+'vocate'='ADVOCATE'
'and' acts as a link.
(Other definitions for advocate that I've seen before include "barman" , "Recommend like counsellor?" , "a barrister in Ayr" , "Publicly recommend" , "Caveat, do about lawyer in court" .)