What does the cryptic crossword clue "Glass apt to be broken as a desperate measure? (4,4)" mean?

The wordplay uses an anagram. anagram of GLASS + APT = LASTGASP The answer is LASTGASP.

Glass apt to be broken as a desperate measure? (4,4)

Daily Mail Cryptic #17174 | 18 Down | 2023-08-30 flower