Partially curtail mental illness (7)

I believe the answer is:

ailment

'illness' is the definition.
(thesaurus)

'partially curtail mental' is the wordplay.
'partially' indicates a hidden word.
'AILMENT' is hidden in the letters of 'curtail mental'.

(Other definitions for ailment that I've seen before include "problem" , "Malady" , "Minor illness" , "Sickness" , "Bodily disorder or disease" .)

I've seen this clue in The Telegraph.

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