Cryptic crossword clue
Toilet contains strange oil – unknown organisms are examined in it 7

The most common and most likely answer to this crossword clue is the 7 letter word BIOLOGY

B
I
O
L
O
G
Y

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The cryptic/wordplay part
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This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
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What does BIOLOGY mean?

BIOLOGY noun
  1. The study of all life or living matter.
  2. The living organisms of a particular region.
  3. The structure, function, and behavior of an organism or type of organism.

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