The most common and most likely answer to this crossword clue is the 12 letter word OXYACETYLENE
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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.
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What does OXYACETYLENE mean?
OXYACETYLENE noun- A mixture of oxygen and acetylene; burns at a high temperature and is used for cutting and welding metals.
- Using this mixture e.g. an oxyacetylene torch