No-one sounds as devout as her (3)
I believe the answer is:
nun
'devout as her' is the definition.
I can't tell whether this definition 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' sounds like 'NUN'.
'as' is the link.
Can you help me to learn more?
(Other definitions for nun that I've seen before include "She's made vows" , "Priory female" , "One who's taken vows" , "Member of convent" , "Mother Superior, perhaps" .)