Joint within generally not wholly visible (5)

I believe the answer is:

hinge

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

'joint' is the definition.
(I know that hinge is a type of hinge)

'within generally not wholly visible' is the wordplay.
'HINGE' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for hinge that I've seen before include "On what a door swings" , "Joint between door and frame" , "Circumstance upon which subsequent events depend; door facilitator" , "What a door depends upon!" , "Door pivot" .)

I've seen this clue in The Times.

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