Crossword Genius

It's singularly useful when you want to hold hands (7)

Ross

I believe the answer is:

manacle

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'hold hands' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for manacle that I've seen before include "Shackle on the wrist" , "Metal shackle" , "Curb" , "Handcuff" , "item restricting movement" .)

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