Crossword Genius

Flying group disturbed (5)

Ross

I believe the answer is:

upset

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Sydney Morning Herald.
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