Pop star Chappell, or a speckled horse (4)

I believe the answer is:

roan

(Other definitions for roan that I've seen before include "Of horse, with coat sprinkled with white or grey hairs" , "Bay horse with white/grey hairs in its coat" , "Reddish-coloured horse" , "Horse with a brownish coat sprinkled with grey" , "Type of 17's coat colouring" .)

I've seen this clue in the Universal.

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