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Floor
to
ceiling,
hell’s
in
gloom
(5)
Floor to ceiling, hell’s in gloom (5)
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The definition is at the end of the clue.
How the clue works
Gloom is the definition. Take HADES for 'hell' and move its bottom letter (S) up to the top — 'floor to ceiling' — giving S followed by HADE to make SHADE.