On the run, chuck the duplicate keys in (7)

I believe the answer is:

fleeing

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'on the run chuck the duplicate keys in' is the definition.
I can't judge whether this definition defines the answer.

'chuck the duplicate keys in' is the wordplay.
'chuck' becomes 'fling' (I've seen this before).
'the duplicate keys' becomes 'ee' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' is an insertion indicator.
'fling' enclosing 'ee' is 'FLEEING'.

Can you help me to learn more?

(Another definition for fleeing that I've seen is " Running away".)

I've seen this clue in the Evening Standard.

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