Rider of cadaverous appearance? (7)

I believe the answer is:

haggard

This clue is a double definition.

'rider' is the first definition.
(H Rider Haggard)

'of cadaverous appearance?' is the second definition.

(Other definitions for haggard that I've seen before include "Looking tired and unwell" , "Looking exhausted and unwell" , "writer" , "Lean" , "Looking exhausted and drawn" .)

I've seen this clue in The Times.

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