9 across
Oversees
advancement
of
ecstasy
in
hell
(5)
Oversees advancement of ecstasy in hell (5)
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The definition is at the beginning of the clue.
How the clue works
Oversees means HEADS, as in one who heads or leads. The wordplay takes HADES (hell) and advances the E (ecstasy) forward through the word, rearranging the letters to give HEADS.