Crossword Genius

Headbanging music on Radio Heart (6)

Ross

I believe the answer is:

mettle

I'm a little stuck... Click here to teach me more about this clue!

'heart' is the definition.
('mettle' can be a synonym of 'heart')

'headbanging music on radio' is the wordplay.
I cannot quite see how this works, but
'music' could be 'me' and 'me' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for mettle that I've seen before include "Inherent character - courage" , "Spirit and courage sound like iron, say" , "Courage sounds like iron, for instance" , "Bravery" , "The courage to carry on" .)

I've seen this clue in The Telegraph.
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