Crossword Genius

What one doing a stretch is subjected to? (7)

Ross

I believe the answer is:

tension

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'one doing a stretch is subjected to?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand how the rest of the clue works.

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(Other definitions for tension that I've seen before include "Uneasiness" , "A pulling strain" , "Stretched state" , "Intones (anag) - stress" , "Mental or emotional strain" .)

I've seen this clue in The Irish News.
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