Cryptic crossword clue
Dairy product, say, fellow’s taken into club 9

The most common and most likely answer to this crossword clue is the 9 letter word BUTTERFAT

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

The straight part
We know that "Dairy product" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dairy product = butterfat.
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 BUTTERFAT mean?

BUTTERFAT noun
  1. The fatty components of milk and other dairy products.

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