Maybe you saw it making a joint entry (5)

I believe the answer is:

tenon

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

'joint entry' is the definition.
'tenon' can be an answer for 'joint' (I've seen this before). I am not certain of the 'entry' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tenon that I've seen before include "Tongue of wood, fits into mortise" , "Shaped end of piece of wood for slotting into a hole." , "Projection used in a mortise joint" , "Wooden projection shaped to fit in a mortise joint" , "Nonet (anag.)" .)

I've seen this clue in the Evening Standard.

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