Additional trouble doesn't begin (5)

I believe the answer is:

other

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

I don't understand the rest of the clue.

(Other definitions for other that I've seen before include "Alternative of two" , "Remaining" , "Alternate; additional" , "Different, disparate" , "Different (from those mentioned)" .)

I've seen this clue in The Times.

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