Cryptic crossword clue
Ewe turns out to be supplier of milk 3,5

The most common and most likely answer to this crossword clue is the 3 plus 5 letter word WET NURSE

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "supplier of milk" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supplier of milk = wet nurse.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does WET NURSE mean?

WET NURSE noun
  1. A woman hired to suckle another woman's child.
  2. (by extension) Someone who treats someone else with excessive care.

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