Marsupial believed extinct, the Tasmanian tiger (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
thylacine
(Other definitions for thylacine that I've seen before include "something stripy not seen for many years" , "Extinct creature" , "Tasmanian tiger" , "Tasmanian wolf; lean, itchy (anag.)" .)