Standard response Mary and Joseph received? (4)

I believe the answer is:

norm

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'standard' is the definition.
(norm is a kind of standard)

I cannot understand how the remainder of the clue works.

(Other definitions for norm that I've seen before include "Standard level of performance" , "Typical, usual" , "Typical pattern or situation" , "Standard, criterion" , "Small boy" .)

I've seen this clue in The Independent.

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