Black -, speedy steed of the highwayman Dick Turpin (4)

I believe the answer is:

bess

(Other definitions for bess that I've seen before include "Operatic mate for Porgy" , "Black - was Dick Turpin's horse" , "Nickname for English queen" , "Queen Elizabeth 1 (sl)" , "George Gershwin opera 'Porgy and . . . .'" .)

I've seen this clue in The Times.

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