Kind of cat or butterfly (13)
I believe the answer is:
tortoiseshell
I believe this is a double definition.
'kind of cat' is the first definition.
'butterfly' is the second definition.
(tortoiseshell is a kind of butterfly)
(Other definitions for tortoiseshell that I've seen before include "Ornamental material" , "Domestic cat mottled in brownish-yellow and black" , "Domestic cat - or little shoes (anag)" , "Butterfly - cat" , "The case of the slow-moving" .)