Crossword Genius

Milk without flaws served up (3)

Ross

I believe the answer is:

tap

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'milk' is the definition.
(both can mean to exploit or use)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tap that I've seen before include "One can be hot or cold?" , "Light touch (hot or cold?)" , "Knock or draw upon" , "Light stroke" , "Somewhere to drink beer" .)

I've seen this clue in The Times.
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