The others don't get as much, being fidgety (8)
I believe the answer is:
restless
'fidgety' is the definition.
(synonyms)
'the others don't get as much' is the wordplay.
'others' becomes 'the rest' (I've seen this in another clue).
'don't get' is a deletion indicator.
'as much' becomes 'less' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'therest' with 'the' taken out is 'rest'.
'rest'+'less'='RESTLESS'
'being' is the link.
Can you help me to learn more?
(Other definitions for restless that I've seen before include "Fidgety, uneasy" , "Constantly active" , "Never still" , "Not relaxed, unsettled" , "Ill at ease" .)