Crossword Genius

Declare in favour of petition (8)

Ross

I believe the answer is:

proclaim

'declare' is the definition.
(I know this)

'in favour of petition' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'petition' becomes 'claim' (claim is a kind of petition).
'pro'+'claim'='PROCLAIM'

(Other definitions for proclaim that I've seen before include "Herald" , "Speak out" , "Announce officially or declare publicly" , "Make a public announcement" , "Reveal" .)

I've seen this clue in The Telegraph.
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