Implant isn't involved in harmful case (7)

I believe the answer is:

instill

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'implant' is the definition.
(I've seen this before)

'isn't involved in harmful case' is the wordplay.
'involved in' indicates an anagram (involved can mean complex or confusing).
'harmful case' becomes 'ill' (I can't justify this - if you can you should believe this answer much more).
'isnt' is an anagram of 'inst'.
'inst'+'ill'='INSTILL'

Can you help me to learn more?

(Other definitions for instill that I've seen before include "Establish" , "Implant" .)

I've seen this clue in The Independent.

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