The most common and most likely answer to this crossword clue is the 8 letter word PLUMPEST
I've seen this crossword clue in Financial Times
P
L
U
M
P
E
S
T
Buddy explains!
The straight part
We know that "Most engorged" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most engorged = plumpest.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 PLUMPEST mean?
PLUMPEST adjective- Having a full and rounded shape; chubby, somewhat overweight.
- Fat.
- Sudden and without reservation; blunt; direct; downright.