A beater's courage? (5)

I believe the answer is:

heart

I believe this is a double definition.

'a beater's' is the first definition.
(organ which beats)

'courage?' is the second definition.
(I know that heart is a type of courage)

(Other definitions for heart that I've seen before include "Earth (anag) -- compassion" , "one in suit" , "Spirit - core" , "Centre; core" , "Nucleus" .)

I've seen this clue in the Evening Standard.

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