Crossword Genius

Don’t try hard enough because stressed? (5,6)

Ross

I believe the answer is:

under strain

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'hard enough because stressed?' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'don't try' is the wordplay.
'don't' becomes 'under' (I can't explain this - if you can you should believe this answer much more).
'try' becomes 'strain' (synonyms).
'under'+'strain'='UNDER STRAIN'

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I've seen this clue in the Evening Standard.
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