Aims often set out in this (9)

I believe the answer is:

manifesto

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'this' is the definition.
The definition suggests a singular noun which matches the answer.

'aims often set out' is the wordplay.
'set out' indicates anagramming the letters.
'aims'+'often'='aimsoften'
'aimsoften' is an anagram of 'MANIFESTO'.

'in' is the link.

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(Other definitions for manifesto that I've seen before include "Public policy declaration" , "Statement of beliefs" , "electoral programme" , "Pre-election policy declaration" , "Statement of policies" .)

I've seen this clue in The Sun.

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