Cryptic crossword clue
Drugbringing partner round, one choked by gas speed?

The most common and most likely answer to this crossword clue is the 16 letter word METHAMPHETAMINE 

I've seen this crossword clue in The Guardian
M
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Buddy explains!

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 METHAMPHETAMINE  mean?

METHAMPHETAMINE  noun
  1. A highly addictive phenethylamine stimulant drug, similar to cocaine. Its systematic (IUPAC) name is (S)-N-methyl-1-phenylpropan-2-amine.

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