The most common and most likely answer to this crossword clue is the 8 letter word WEREWOLF
W
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F
More clues leading to the result WEREWOLF
- Reduced watts before reversing current in transformer
- Our lot are blooming revolting, being liable to change
- Monster in dread, wiping out a climbing plant
- Monster our team encounters upriver
- Mythical being lived by rising stream
- People come out in retreat, finding monster
- Fantastic being with us on westbound jet
- A monster we love, contrarily
- Bloomer turning up after partners’ howler
- Flower we harvested for beastly character
Buddy explains!

The straight part
We know that "A monster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a monster = werewolf.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 WEREWOLF mean?
WEREWOLF noun- A person who is transformed or can transform into a wolf or a wolflike human, often said to transform during a full moon.