Cryptic crossword clue
Its glue dissolved, becoming most hideous 7

The most common and most likely answer to this crossword clue is the 7 letter word UGLIEST

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "most hideous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most hideous = ugliest.
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 UGLIEST mean?

UGLIEST adjective
  1. Displeasing to the eye; not aesthetically pleasing.
  2. Displeasing to the ear or some other sense.
  3. Offensive to one's sensibilities or morality.
  4. Ill-natured; crossgrained; quarrelsome.
  5. Unpleasant; disagreeable; likely to cause trouble or loss.

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