21 down
Appear
upset
about
King
supporting
Eastern
Arabic
rulers
(6)
Appear upset about King supporting Eastern Arabic rulers (6)
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The definition is at the end of the clue.
How the clue works
Arabic rulers defines EMEERS (variant spelling of emirs/ameers). E (Eastern) is followed by SEEM (appear) reversed ("upset") giving MEES, with R (King) placed inside, giving E + ME(R)ES = EMEERS.