Heard no-one as devout as her (3)

I believe the answer is:

nun

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'devout as her' is the definition.
I can't judge whether this defines the answer.

'heard no-one' is the wordplay.
'heard' shows a homophone (sound like).
'no' becomes 'n' (common abbreviation).
'n'+'one'='none'
'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 "Religious woman, a palindrome" , "Sister of mercy" , "religious person" , "Woman with a habit" , "Black and white pigeon" .)

I've seen this clue in The Mirror.

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