Crossword Genius

Trailers carrying current benefits (4)

Ross

I believe the answer is:

aids

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'benefits' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

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(Other definitions for aids that I've seen before include "Helps with a dread disease" , "Condition following infection with HIV virus" , "Said to be an international disease" , "Comes to the rescue" , "Said to be a dread modern disease" .)

I've seen this clue in The Sunday Times and The Times.
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