Crossword Genius

Joint that's swinging? (5)

Ross

I believe the answer is:

hinge

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

This clue might be a double definition.

'joint' is the first definition.
(type of joint)

'swinging?' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for hinge that I've seen before include "Key principle" , "Part of a door" , "Circumstance upon which subsequent events depend; door facilitator" , "Door support" , "Pivotal point" .)

I've seen this clue in The Sun.
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