He's capable of being snide (5)

I believe the answer is:

denis

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'he's' is the definition.
(I've seen this before)

'capable of being snide' is the wordplay.
'snide' can be anagrammed to 'DENIS'.
However, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for denis that I've seen before include "- Healey, former Chancellor of the Exchequer" , "Patron saint of France" , "St -, first Paris bishop" .)

I've seen this clue in the Evening Standard.

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