Demand for many a purpose (5)

I believe the answer is:

claim

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'demand for' is the definition.
(thesaurus)

'many a purpose' is the wordplay.
'many a' becomes 'cl' (I can't explain this - if you can you should believe this answer much more).
'purpose' becomes 'aim' (synonyms).
'cl'+'aim'='CLAIM'

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(Other definitions for claim that I've seen before include "Allege" , "Right; demand this" , "Put in for" , "Formal request" , "Assertion; demand" .)

I've seen this clue in the Evening Standard.

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