What does the cryptic crossword clue "Such a seal disguising the crime (8)" mean?

The definition is "Such a seal". The wordplay uses an anagram. anagram of THE + CRIME = HERMETIC; definition: "Such a seal" The answer is HERMETIC.

Such a seal disguising the crime (8)

Guardian Cryptic #29064 | 26 Across | 2023-05-08 flower