Sitting down (9)
I believe the answer is:
sedentary
'sitting down' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sedentary that I've seen before include "Sitting a lot and taking little exercise" , "not exercising one's talents?" , "Tending to stay seated" , "Yes, red ant could be sitting" , "inactive" .)