The most common and most likely answer to this crossword clue is the 6 letter word GORGON
G
O
R
G
O
N
More clues leading to the result GORGON
- Monster in building or gone?
- Alcoholic drink knocked back by working woman that’s monstrously repulsive
- Monster cheese a French writer avoided
- She turned to stone
- What abstainers drink, reverting? It’s appallingly ugly
- Monster
- No booze, get high monster!
- Monster to move right, and turn north
- Hideous thing where no rum and water served up
Buddy explains!

The straight part
We know that "Monster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case monster = gorgon.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 GORGON mean?
GORGON noun- A vicious female monster from Greek mythology with sharp fangs and hair of living, venomous snakes. One of the three sisters: Medusa, Stheno and Euryale
- An intimidating, ugly, or disgusting woman; anything hideous or horrid.
- Like a gorgon; very ugly or terrifying.