Manx, for one (3)
I believe the answer is:
cat
I believe this is a double definition.
'manx' is the first definition.
(I've seen this in another clue)
'for one' is the second definition.
(thesaurus)
(Other definitions for cat that I've seen before include "Carnivore; whip" , "Sailor's whip with nine knotted strands" , "Domestic animal" , "Lash < jazz fan" , "Animal (domesticated or wild)" .)