Crossword Genius

Terrible cart crash involved soldier (6)

Ross

I believe the answer is:

tragic

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'terrible' is the definition.
(tragic can mean terrible or sad)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tragic that I've seen before include "heartbreaking" , "Deeply distressing" , "Exceedingly sad" , "Pitiable" , "Mournful" .)

I've seen this clue in The Mirror.
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