Otherwise (4)

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3 4 6 2,3

2,4

or else

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

This is all the clue.

(Other definitions for or else that I've seen before include "Vague threat" , "If not, then - vaguely threatening" , "Otherwise - that's a threat" , "Statement that threatens" , "If not, then - sounds like a threat" .)

I've seen this clue in the Evening Standard, the USA Today and The Mirror.

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