Cryptic crossword clue
Drug found in water analysed in containers 10

The most common and most likely answer to this crossword clue is the 10 letter word TUPPERWARE

I've seen this crossword clue in Financial Times
T
U
P
P
E
R
W
A
R
E

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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 TUPPERWARE mean?

TUPPERWARE noun
  1. A food-storage container (often plastic), or a set of such containers.

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