The most common and most likely answer to this crossword clue is the 10 letter word HYPERBOLIC
I've seen this crossword clue in Independent
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More clues leading to the result HYPERBOLIC
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The cryptic/wordplay part
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What does HYPERBOLIC mean?
HYPERBOLIC adjective- Of or relating to hyperbole.
- Using hyperbole: exaggerated.
- Of or pertaining to a hyperbola.
- Indicates that the specified function is a hyperbolic function rather than a trigonometric function.
- (of a metric space or a geometry) Having negative curvature or sectional curvature.
- (of an automorphism) Whose domain has two (possibly ideal) fixed points joined by a line mapped to itself by translation.
- Of, pertaining to or in a hyperbolic space (a space having negative curvature or sectional curvature).