Crossword Genius

Died clutching it, most unhappy, you make clear (6)

Ross

I believe the answer is:

stress

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'make clear' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for stress that I've seen before include "Dwell on" , "what causes tension" , "result of being overworked" , "Ictus" , "Physical or mental over-exertion" .)

I've seen this clue in the Evening Standard.
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