In my past it involved inflammation of the eardrum (10)

I believe the answer is:

tympanitis

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'inflammation of the eardrum' is the definition.
The definition suggests a singular noun which matches the answer.

'in my past it involved' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'in'+'my'+'past'+'it'='inmypastit'
'inmypastit' with letters rearranged gives 'TYMPANITIS'.

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I've seen this clue in The Times.

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