Crossword Genius

Catch fish illegally to cook in milk? (5)

Ross

I believe the answer is:

poach

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

'cook in milk?' is the definition.
'poach' can be an answer for 'cook' (thesaurus). I'm not certain of the 'in milk?' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for poach that I've seen before include "Cook in boiling liquid - steal game" , "Appropriate" , "Steal (game etc)" , "Cook (an egg) in water" , "Take game illegally from land or water" .)

I've seen this clue in The Sun.
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