The most common and most likely answer to this crossword clue is the 10 letter word WITCHCRAFT
I've seen this crossword clue in The Times
W
I
T
C
H
C
R
A
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T
More clues leading to the result WITCHCRAFT
Buddy explains!

The straight part
We know that "Magic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case magic = witchcraft.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 WITCHCRAFT mean?
WITCHCRAFT noun- The practice of witches; magic, sorcery or the use of supernatural powers to influence or predict events.
- Something, such as an advanced technology, that seems almost magical.