The most common and most likely answer to this crossword clue is the 7 letter word EMETINE
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More clues leading to the result EMETINE
Buddy explains!
The straight part
We know that "This may make you sick" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this may make you sick = emetine.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 EMETINE mean?
EMETINE noun- A white crystalline bitter alkaloid, chemical formula C29H40N2O4, extracted from ipecacuanha root, and regarded as its peculiar emetic principle.