The most common and most likely answer to this crossword clue is the 11 letter word ANIMALCULES
I've seen this crossword clue in The Times
A
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M
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The straight part
We know that "amoebas etc" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case amoebas etc = animalcules.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 ANIMALCULES mean?
ANIMALCULES noun- A small animal.
- A microscopic aquatic animal or protozoan.
- A spermatozoon.