One can play it still (6)
I believe the answer is:
possum
This clue could be a double definition.
'one can play' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'it still' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for possum that I've seen before include "Play -- (pretend to be dead)" , "American marsupial (that plays dead?)" , "Tree-dwelling Australasian marsupial" , "Thick-furred marsupial" , "Small animal with a pouch" .)