Endless traffic jams? Tax! (6)

I believe the answer is:

tariff

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'tax' is the definition.
(tariff is a kind of tax)

I can't explain the rest of the clue.

(Other definitions for tariff that I've seen before include "Tax or duty on a class of imports" , "Government tax on imports" , "Price list - import tax" , "List of duties on imports or exports" , "Tax or duty to be paid on some imports or exports" .)

I've seen this clue in The Hindu.

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