Brief notice on election including accountant (8)

I believe the answer is:

advocate

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'brief' is the definition.
(I've seen this before)

'notice on election including accountant' is the wordplay.
'notice' becomes 'ad' (both can mean an advertisement).
'on election' becomes 'vote' (I can't justify this - if you can you should believe this answer much more).
'including' indicates putting letters inside.
'accountant' becomes 'CA' (abbreviation for chartered accountant).
'vote' placed around 'ca' is 'vocate'.
'ad'+'vocate'='ADVOCATE'

Can you help me to learn more?

(Other definitions for advocate that I've seen before include "Recommend - lawyer" , "Promote" , "Defend" , "Publicly support (cause)" , "a barrister in Ayr" .)

I've seen this clue in The Telegraph.

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