A notedly hard-hearted listener? (3)

I believe the answer is:

ear

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'listener?' is the definition.
(body part which hears or listens)

'a notedly hard-hearted' is the wordplay.
'EAR' is hidden in amongst the letters.
But, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for ear that I've seen before include "Lend one and listen" , "Part of cereal plant containing seed" , "Musical appreciation" , "Corn seed-holder" , "A corny bit" .)

I've seen this clue in the Evening Standard.

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