The most common and most likely answer to this crossword clue is the 6 letter word EPIPEN
I've seen this crossword clue in Independent
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More clues leading to the result EPIPEN
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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 EPIPEN mean?
EPIPEN noun- An epinephrine/adrenaline autoinjector. A lifesaving device designed to ease the symptoms of anaphylaxis/anaphylactic shock, so as to save the life of the victim of the extreme allergic reaction, by injecting a dose of adrenaline/epinephrine through a spring-loaded needle that punches into the tissue it is triggered against.