Cryptic crossword clue
Not sleepy, frantic youngster heartlessly tucked in — it’s artificial 11

The most common and most likely answer to this crossword clue is the 11 letter word POLYSTYRENE

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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 POLYSTYRENE mean?

POLYSTYRENE noun
  1. A vinylic polymer of styrene, CH2CHphenyl.
  2. An alkane chain of benzene molecules, RCH2CHphenylR.

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