21 across
Prince
arrived
in
Hungary
on
vacation
(5)
Prince arrived in Hungary on vacation (5)
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The definition is at the beginning of the clue.
How the clue works
Prince is your definition here, nodding to Prince Harry. Now, "Hungary on vacation" tells you to hollow that word out, leaving just the outer letters H and Y, and you tuck ARR (arrived) inside them to build H-ARR-Y.