... uneasy -- others not so much (8)
I believe the answer is:
restless
'uneasy' is the definition.
('restless' can be a synonym of 'uneasy')
'others not so much' is the wordplay.
'others' becomes 'rest' (I've seen this before).
'not so much' becomes 'less' (I've seen this before).
'rest'+'less'='RESTLESS'
(Other definitions for restless that I've seen before include "Constantly moving about or fidgeting" , "Uneasy and agitated" , "Wakeful" , "Ill at ease" , "Unable to keep still" .)