One sly chap goes around to doctor for this (8)

I believe the answer is:

physical

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'doctor for this' is the definition.
The definition suggests a singular noun but the answer is not.

'one sly chap goes around' is the wordplay.
'one' becomes 'I' (Roman numeral).
'goes around' indicates anagramming the letters.
'i'+'sly'+'chap'='islychap'
'islychap' anagrammed gives 'PHYSICAL'.

'to' is the link.

Can you help me to learn more?

(Other definitions for physical that I've seen before include "Involving bodily contact" , "Corporeal" , "Medical check" , "Achy lips (anag)" , "Having a material existence" .)

I've seen this clue in The Irish Times.

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