Excess finished, son flying to work (10)

I believe the answer is:

oversupply

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'excess' is the definition.
(thesaurus)

'finished son flying to work' is the wordplay.
'finished' becomes 'over' (over can mean finished or ended).
'son flying' becomes 'sup' (I am not sure about this - if you are sure you should believe this answer much more).
'to work' becomes 'ply' (to ply a trade is to work at it).
'over'+'sup'+'ply'='OVERSUPPLY'

Can you help me to learn more?

(Another definition for oversupply that I've seen is " Provide with too much".)

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

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