The most common and most likely answer to this crossword clue is the 5 letter word ILEUM
I
L
E
U
M
More clues leading to the result ILEUM
- Brought up breakfast cereal, bypassing the beginning of stomach and small intestine
- One left European Union — member which might help form motion?
- Line that is to bag — let me see part of gut
- Upside-down cereal misses small intestine
- Currency secreted in compiler’s gut
- Agile umpire’s concealing a bit of a gut
- Leading scientist withdraws from backing breakfast cereal as ‘essential aid to digestion’
- Food processor taking seconds off serving up breakfast cereal
- Multimedia is bad, to admit takes some guts
Buddy explains!

The straight part
We know that "a bit of a gut" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a bit of a gut = ileum.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 ILEUM mean?
ILEUM noun- The last, and usually the longest, division of the small intestine; the part between the jejunum and large intestine.