Like sis, off ill in medical procedure (4,2,4)

I believe the answer is:

kiss of life

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'medical procedure' is the definition.
The definition suggests a singular noun which matches the answer.

'like sis off ill' is the wordplay.
'ill' is an anagram indicator.
'like'+'sis'+'off'='likesisoff'
'likesisoff' is an anagram of 'KISS OF LIFE'.

'in' is the link.

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(Other definitions for kiss of life that I've seen before include "First aid treatment" , "Artificial respiration" , "Emergency resuscitation" , "Mouth-to-mouth resuscitation" , "first-aid" .)

I've seen this clue in The Telegraph.

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