Cryptic crossword clue
The third gut-wrenching sumo degree secured 6

The most common and most likely answer to this crossword clue is the 6 letter word OMASUM

I've seen this crossword clue in Financial Times
O
M
A
S
U
M

Buddy explains!

The straight part
We know that "The third gut" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case the third gut = omasum.
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 OMASUM mean?

OMASUM noun
  1. The third part of the stomach of a ruminant.

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