Cryptic crossword clue
Fat fool starts failing test subject 3,3

The most common and most likely answer to this crossword clue is the 3 plus 3 letter word LAB RAT

L
A
B
R
A
T

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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.

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