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Unfortunate lapses following treatment introduced by hospital (7)

Ross

I believe the answer is:

hapless

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'unfortunate' is the definition.
(similar in meaning)

I can't explain the remainder of the clue.

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(Other definitions for hapless that I've seen before include "Pathetic" , "He slaps (anag) - unlucky" , "Ill-fated" , "Piteous" , "Ill-starred" .)

I've seen this clue in The Independent.
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