Protein in dairy item, for example (4,2,5)

I believe the answer is:

case in point

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This clue might be a double definition.

'protein in dairy item' is the first definition.
'case in point' can be an answer for 'item' (thesaurus). I'm unsure of the 'protein in dairy' bit.

'example' is the second definition.
(case in point is a kind of example)

'for' acts as a link.

Can you help me to learn more?

(Other definitions for case in point that I've seen before include "Particular example" , "Example of what is under discussion" .)

I've seen this clue in The Times.

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