Crossword Genius

Extremely tough work environ­ment causing various ailments (4,4)

Ross

I believe the answer is:

salt mine

'extremely tough work environment' is the definition.

'various ailments' is the wordplay.
'various' is an anagram indicator.
'ailments' anagrammed gives 'SALT-MINE'.

'causing' is the link.

(Other definitions for salt mine that I've seen before include "Deep pit containing a white substance" , "Ailments (anag)" , "Excavation" , "Source of flavouring" .)

I've seen this clue in The Guardian.
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