German philosopher's ailment UK man treated (8,4)

I believe the answer is:

immanuel kant

I'm a little stuck... Click here to teach me more about this clue!

'german philosopher's' is the definition.
'Immanuel Kant' can be an answer for 'philosopher's' (Immanuel Kant is an example). I am not certain of the 'german' bit.

'ailment uk man treated' is the wordplay.
'treated' indicates anagramming the letters.
'ailment'+'uk'+'man'='ailmentukman'
'ailmentukman' anagrammed gives 'IMMANUEL KANT'.

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I've seen this clue in The Times.

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