Inactive? Yes, daren't move (9)
I believe the answer is:
sedentary
'inactive?' is the definition.
('sedentary' can be similar in meaning to 'inactive')
'yes daren't move' is the wordplay.
'move' indicates anagramming the letters.
'yes'+'darent'='yesdarent'
'yesdarent' anagrammed gives 'SEDENTARY'.
(Other definitions for sedentary that I've seen before include "Tending to stay seated" , "Tending to spend much time seated" , "Still working" , "not exercising one's talents?" , "Sitting much and taking little exercise" .)