Favouring the suggestion to have advertising (9)

I believe the answer is:

promotion

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'advertising' is the definition.
(thesaurus)

'favouring the suggestion' is the wordplay.
'favouring' becomes 'pro' (I've seen this in other clues).
'the suggestion' becomes 'motion' (I can't justify this - if you can you should give a lot more credence to this answer).
'pro'+'motion'='PROMOTION'

'to have' acts as a link.

Can you help me to learn more?

(Other definitions for promotion that I've seen before include "Publicity campaign" , "movement?" , "Advancement" , "that should result in more money" , "upgrading" .)

I've seen this clue in the Evening Standard.

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