The most common and most likely answer to this crossword clue is the 11 letter word THINGAMABOB
T
H
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N
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A
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A
B
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B
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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 THINGAMABOB mean?
THINGAMABOB noun- A thing or person whose actual name is unknown or forgotten.