Leaves band over dispute previously, is obliged to go (7)
I believe the answer is:
departs
'leaves' is the definition.
('depart' can be a synonym of 'leave')
'band over dispute previously is obliged to go' is the wordplay.
I cannot really understand how this works, but
'go' could be 'part' (I've seen this in another clue) and 'part' is found within the answer.
The remaining letters 'des' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for departs that I've seen before include "Goes away" , "Goes, leaves" , "Does runner" , "Quits" .)