24 down
Antifa
illegally
concealing
collapse
(4)
Antifa illegally concealing collapse (4)
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The definition is at the end of the clue.
How the clue works
Right, so collapse is your definition there, as in something giving way or failing. Now look at "concealing" — that's your hidden-word signal, and sure enough FAIL is sitting there tucked inside "antiFA ILlegally", spanning across the two words.