The clap shared between two old couples is a magical thing (6)
I believe the answer is:
voodoo
'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" .)