Cryptic crossword clue
Semi-freeze on ozone-depleting gas 5

The most common and most likely answer to this crossword clue is the 5 letter word FREON

F
R
E
O
N

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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 FREON mean?

FREON noun
  1. Any of several non-flammable refrigerants based on halogenated hydrocarbon including R-12, R-22, and R-23.
  2. (refrigeration) A gaseous ozone-depleting refrigerant
  3. (environmentalism) A chlorofluorocarbon

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