Cryptic crossword clue
Pavlovian behaviour — young animal left, captivated by sound of bell 8

The most common and most likely answer to this crossword clue is the 8 letter word DROOLING

I've seen this crossword clue in The Guardian
D
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Buddy explains!

The straight part
We know that "Pavlovian behaviour" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pavlovian behaviour = drooling.
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 DROOLING mean?

DROOLING verb
  1. To secrete saliva, especially in anticipation of food.
  2. To secrete any substance in a similar way.
  3. To react to something with uncontrollable desire.
  4. To talk nonsense; drivel.
DROOLING noun
  1. The act of one who drools.

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