Once always included in prayers (3)

I believe the answer is:

aye

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'once always' is the definition.
I can't tell whether this definition defines the answer.

'included in prayers' is the wordplay.
'included in' indicates a hidden word.
'AYE' is hidden within 'prayers'.

Can you help me to learn more?

(Other definitions for aye that I've seen before include "Affirmative answer" , "Entirely one" , "Word of assent" , "Positive voting response" , "Yes answer in voting" .)

I've seen this clue in The Globe and Mail.

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