Crossword Genius

The clap shared between two old couples is a magical thing (6)

Ross

I believe the answer is:

voodoo

I'm a little stuck... Click here to teach me more about this clue!

'thing' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for voodoo that I've seen before include "Form of magic" , "Caribbean cult involving witchcraft" , "Religious cult, involves witchcraft and animal deities" , "Black magic in Haiti" , "Type of witchcraft" .)

I've seen this clue in The Independent.
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