No-one sounds as pious as her (3)
I believe the answer is:
nun
'pious as her' is the definition.
I can't tell whether this defines the answer.
'no-one sounds' is the wordplay.
'no' becomes 'none' (I've seen this before).
'one sounds' indicates a 'sounds like' (homophone) clue.
'none' is a homophone of 'NUN'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for nun that I've seen before include "She's a member of a religious community" , "Sister of mercy" , "Holy sister" , "Woman in religious order" , "Convent dweller" .)