Welded, not married, in antiquity (3)

I believe the answer is:

eld

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

'antiquity' is the definition.
(I've seen this in another clue)

'welded not married' is the wordplay.
'ELD' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'in' acts as a link.

Can you help me to learn more?

(Another definition for eld that I've seen is " Old age".)

I've seen this clue in the Sydney Morning Herald.

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