Crossword Genius

Openings in journal regularly taken (3)

Ross

I believe the answer is:

ora

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'openings' is the definition.
(os is a kind of opening)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for ora that I've seen is " Pray for us - ... pro nobis".)

I've seen this clue in The Times and The Sunday Times.
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