The most common and most likely answer to this crossword clue is the 8 letter word FIENDISH
I've seen this crossword clue in The Guardian
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H
More clues leading to the result FIENDISH
- Fine breaking piece of crockery for savage
- I stop tucking into cod, say — far too tough
- Beastly animal biting one on the bottom
- Perhaps carp about close one that’s extremely cruel
- Demonic sea creature’s hiding close to me
- Horrible haddock? Dine, getting upset inside
- Possible description of sudoku, kind of finished
- Complex building finished
- Pal losing rag initially — his indisposition is extremely unpleasant
- Very hard one to complete, outwardly brill?
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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 FIENDISH mean?
FIENDISH adjective- Sinister; evil; like a fiend.