Crossword Genius

Literary brothers resolute at hearing (5)

Ross

I believe the answer is:

grimm

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'literary brothers resolute at hearing' is the definition.
I can't judge whether this definition defines the answer.

'resolute at hearing' is the wordplay.
'resolute' becomes 'grim' (I've seen this before).
'at hearing' becomes 'm' (I can't justify this - if you can you should give a lot more credence to this answer).
'grim'+'m'='GRIMM'

Can you help me to learn more?

(Other definitions for grimm that I've seen before include "Jacob & Wilhelm -, fairy tale collectors" , "Folk-tale brothers' name" , "Fairy tale telling brother" , "Jacob and Wilhelm -, German folklorists" , "Old yarn collector" .)

I've seen this clue in The Independent.
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