Cryptic crossword clue
A boy, never to break routine, picked up an old monster 11

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

I've seen this crossword clue in The Times
T
Y
R
A
N
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Buddy explains!

The straight part
We know that "an old monster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case an old monster = tyrannosaur.
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.

Crossword Answer definitions

TYRANNOSAUR noun
  1. Any large bipedal carnivorous dinosaur, of the family Tyrannosauridae, that lived in North America during the Cretaceous period.

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