19 across
Edward
VI
possibly
died
thrashing
about
on
reflection
(5)
Edward VI possibly died thrashing about on reflection (5)
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The definition is at the beginning of the clue.
How the clue works
Edward VI is an example of a Edward VI possibly — a Tudor monarch. The wordplay takes ROUT (thrashing) around D (died) to give RODUT, then "on reflection" reverses it to spell TUDOR.