10 across
Ill-advised
Greek
‘humor’
showing
Asian
guerrilla
movement
(5,5)
Ill-advised Greek ‘humor’ showing Asian guerrilla movement (5,5)
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The definition is at the end of the clue.
How the clue works
Point to Asian guerrilla movement at the end — that's your definition, pointing to the Cambodian Khmer Rouge. "Ill-advised" is the anagram signal, telling you to shuffle the letters of "Greek humor" about until they settle into KHMER ROUGE.