Flying group disturbed (5)
I believe the answer is:
upset
'disturbed' is the definition.
(I know that disturbed can be written as upset)
'flying group' is the wordplay.
'flying' becomes 'up' (I can't explain this - if you can you should believe this answer much more).
'group' becomes 'set' (both can mean a collection).
'up'+'set'='UPSET'
Can you help me to learn more?
(Other definitions for upset that I've seen before include "Unexpected result" , "Disordered - unexpected defeat" , "Disturb the balance or stability of" , "Overturn, disturb" , "Distraught" .)