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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
Look at gloom at the end — that's your definition. Hell's gives you HADES (the underworld), and floor to ceiling is your anagram indicator (the idea of flipping everything upside down), so you scramble HADES to get your answer.