Business caught providing Trump with a boost (7)

I believe the answer is:

traffic

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'business' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for traffic that I've seen before include "Flow of vehicles" , "Vehicles moving on public highways" , "Group" , "Deals" , "that may be in jam?" .)

I've seen this clue in The Independent.

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