Disturbed, leaderless barbarian relaxed (9)
I believe the answer is:
unsettled
'disturbed' is the definition.
(synonyms)
'leaderless barbarian relaxed' is the wordplay.
'leaderless' means to remove the first letter.
'barbarian' becomes 'hun' (I've seen this before).
'relaxed' becomes 'settled' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hun' with its initial letter taken off is 'un'.
'un'+'settled'='UNSETTLED'
Can you help me to learn more?
(Other definitions for unsettled that I've seen before include "Disturbed" , "outstanding" , "Still to confirm" , "Not sure" , "Troubled" .)