Revolutionary diarist with peak wine (6,5)

I believe the answer is:

chenin blanc

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'wine' is the definition.
(Chenin blanc is an example)

'revolutionary diarist with peak' is the wordplay.
I cannot quite understand how this works, but
'revolutionary' could be 'che' (Che Guevara) and 'che' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for chenin blanc that I've seen before include "Loire or California grape - NBC Channel I (anag)" , "Type of white wine" .)

I've seen this clue in The Guardian.

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