25 across
Exciting
yet
gloomy
study
of
roots
(9)
Exciting yet gloomy study of roots (9)
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The definition is at the end of the clue.
How the clue works
The definition is study of roots — as in word origins. "Exciting" is your anagram indicator, and if you jumble up the letters of yet gloomy you'll find they rearrange neatly into your answer.