Crossword Genius

Tenacious or eager person; type of dog (7)

Ross

I believe the answer is:

terrier

(Other definitions for terrier that I've seen before include "Sealyham, for example" , "Small, active breed of dog" , "Breed of dog - Territorial Army volunteer" , "One who volunteers to fight" , "Small hunting dog" .)

I've seen this clue in The Times.
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