River Rock? (6)

I believe the answer is:

hudson

I believe this is a double definition.

'river' is the first definition.
(I know that Hudson is a river)

'rock?' is the second definition.
(American actor Rock Hudson)

(Other definitions for hudson that I've seen before include "New York river; Upstairs/ Downstairs butler" , "did for Holmes" , "8 [BUTLER" , "Rock -, - bay" , "Large bay in Canada" .)

I've seen this clue in The Guardian.

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