The most common and most likely answer to this crossword clue is the 4 letter word CAUL
C
A
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The straight part
We know that "epiploon" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case epiploon = caul.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 CAUL mean?
CAUL noun- A style of close-fitting circular cap worn by women in the sixteenth century and later, often made of linen.
- (often capitalized, used on maps) An entry to a mill lead taken from a burn or stream (a mill lead (or mill waterway) is generally smaller than a canal but moves a large volume of water).
- A membrane.
- The thin membrane which covers the lower intestines; the omentum.
- The amnion which encloses the foetus before birth, especially that part of it which sometimes shrouds a baby’s head at birth (traditionally considered to be good luck).
- The surface of a press that makes contact with panel product, especially a removable plate or sheet.
- A strip or block of wood used to distribute or direct clamping force.
- Caul fat.