The most common and most likely answer to this crossword clue is the 5 letter word OBEAH
I've seen this crossword clue in Financial Times
O
B
E
A
H
More clues leading to the result OBEAH
- Honour a husband, showing a sort of charm
- A sorcerer may practice it, partly to be a hardman
- Hiding in wardrobe, a handsome Caribbean charmer
- Old boy? He turned up, bearing a kind of charm
- Spiritualism and honour, I see
- Love place to sunbathe avoiding cold spells
- Honour with a hard form of sorcery
- Zombie oath appearing regularly?
- Zombie oath used regularly in Caribbean sorcery
Buddy explains!

The straight part
We know that "form of sorcery" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case form of sorcery = obeah.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 OBEAH mean?
OBEAH noun- A form of folk magic, medicine or witchcraft originating in Africa and practised in parts of the Caribbean.
- A magician or witch doctor of the magic craft.
- A spell performed in the practice of the magic craft; an item associated with such a spell.
- To bewitch using this kind of folk magic.