Rover showing rough coat, reportedly (7)

I believe the answer is:

corsair

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'rover' is the definition.
(thesaurus)

I can't explain the remainder of the clue.

(Other definitions for corsair that I've seen before include "Pirate from N. Africa" , "Main villain" , "Privateer" , "Marauder" , "Barbary pirate - pirate ship" .)

I've seen this clue in The Telegraph.

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