Crossword Genius

Hotheaded fellow, this beast? (4)

Ross

I believe the answer is:

hart

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'this beast?' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for hart that I've seen before include "Stag" , "providing material for Richard Rodgers?" , "Songwriting partnership, Rodgers and --" , "Deer; Lorenz --, lyricist" , "Beast" .)

I've seen this clue in the Evening Standard.
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