Fake revolutionary hears about new beliefs (9)

I believe the answer is:

doctrines

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'beliefs' is the definition.
(I know this)

'fake revolutionary hears about new' is the wordplay.
'fake revolutionary' becomes 'doc' (I can't explain this - if you can you should give a lot more credence to this answer).
'hears' becomes 'tries' (to try or hear in the legal sense).
'about' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'tries' going around 'n' is 'trines'.
'doc'+'trines'='DOCTRINES'

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I've seen this clue in The Independent.

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