Cryptic crossword clue
Chemical in excess supply taken to a pit 9

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

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "Chemical" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chemical = glutamine.
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 GLUTAMINE mean?

GLUTAMINE noun
  1. A nonessential amino acid C5H10N2O3 found in most animal and plant proteins.

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