Clear O for what hopes to attract many Xs (9)

I believe the answer is:

manifesto

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'what hopes to attract many xs' is the definition.
I can't judge whether this defines the answer.

'clear o' is the wordplay.
'clear' becomes 'manifest' (synonyms).
'manifest'+'o'='MANIFESTO'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for manifesto that I've seen before include "Declaration of intentions by a political party" , "Pre-election promises" , "set of political proposals" , "Proclamation" , "Soften aim (anag) - platform" .)

I've seen this clue in The Guardian.

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