Cryptic crossword clue
Increases in cooked tripe for sale 12

The most common and most likely answer to this crossword clue is the 12 letter word PROLIFERATES

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

The straight part
We know that "Increases" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case increases = proliferates.
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 PROLIFERATES mean?

PROLIFERATES verb
  1. To increase in number or spread rapidly; to multiply.

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