Ascetic leader Vishnu will protect (7)

I believe the answer is:

dervish

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'ascetic' is the definition.
(I know that dervish is a type of Fakir)

'leader vishnu will protect' is the wordplay.
'DERVISH' is hidden within the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for dervish that I've seen before include "Member of Muslim order noted for wild dancing and whirling" , "Muslim noted for frenzied dancing" , "fraternity member" , "See 8" , "Muslim ascetic (given to whirling movements?)" .)

I've seen this clue in The Telegraph.

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