Plan for site (11)

I believe the answer is:

proposition

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'plan' is the definition.
(thesaurus)

'for site' is the wordplay.
'for' becomes 'pro' (as in being 'pro' something).
'site' becomes 'position' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'pro'+'position'='PROPOSITION'

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(Other definitions for proposition that I've seen before include "Statement expressing a judgement or opinion" , "Suggestion put forward" , "Suggested plan" , "Manifesto, plan" , "to try to get off with" .)

I've seen this clue in The Telegraph.

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