Hindu deity, an avatar of Vishnu (7)
I believe the answer is:
krishna
This clue is a double definition.
'hindu deity' is the first definition.
(Krishna is an example)
'an avatar of vishnu' is the second definition.
(I've seen this in another clue)
(Other definitions for krishna that I've seen before include "Most important avatar of Vishnu" , "Hare ..., religious sect whose devotees wear saffron robes" , "Most celebrated of Hindu deities" , "Hindu deity - Sikh ran (anag)" , "lord?" .)