Cryptic crossword clue
Object to alternative level of acid in painkiller 9

The most common and most likely answer to this crossword clue is the 9 letter word ENDORPHIN

I've seen this crossword clue in Financial Times
E
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 ENDORPHIN mean?

ENDORPHIN noun
  1. Any of a group of peptide hormones found in the brain that act as neurotransmitters and have properties similar to morphine.

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