Escape paying extra for unauthorised dispatch (3-7)

I believe the answer is:

fly-tipping

'unauthorised dispatch' is the definition.

'escape paying extra' is the wordplay.
'escape' becomes 'fly'.
'paying extra' becomes 'tipping'.
'fly'+'tipping'='FLY-TIPPING'

'for' is the link.

(Another definition for fly-tipping that I've seen is " Unauthorised disposal of waste materials".)

I've seen this clue in The Times.

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