Old Antioch recipe produced this colour (5)

I believe the answer is:

ochre

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

'this colour' is the definition.
(ochre is a kind of colour)

'old antioch recipe' is the wordplay.
'OCHRE' is hidden within the letters.
However, I'm not sure how this is indicated.

'produced' is the link.

Can you help me to learn more?

(Other definitions for ochre that I've seen before include "paint type" , "Money" , "Yellow/brown/red pigment" , "Earthy colour" , "Brown" .)

I've seen this clue in The Irish Times.

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