Others not as fidgety (8)
I believe the answer is:
restless
'fidgety' is the definition.
(synonyms)
'others not' is the wordplay.
'others' becomes 'rest' (eg the rest of a group).
'not' becomes 'less' (I've seen this in other clues).
'rest'+'less'='RESTLESS'
'as' acts as a link.
(Other definitions for restless that I've seen before include "Always on the move" , "Unable to settle" , "Not relaxed, unsettled" , "Constantly active" , "Never still" .)