Recluse beginning to appear agnostic is powerless (7)
I believe the answer is:
ascetic
'recluse' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for ascetic that I've seen before include "Frugal" , "One practises self-denial as a spiritual discipline" , "reclusive" , "Self-denying person who shuns ordinary pleasures" , "Austere disciple" .)