The most common and most likely answer to this crossword clue is the 10 letter word MESMERISED
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Buddy explains!

The straight part
We know that "was entrancing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was entrancing = mesmerised.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 MESMERISED mean?
MESMERISED verb- To exercise mesmerism on; to affect another person, such as to heal or soothe, through the use of animal magnetism.
- To spellbind; to enthrall.