Standard kept by man or machine? (4)

I believe the answer is:

norm

'standard' is the definition.
(I've seen this before)

'kept by man or machine?' is the wordplay.
'kept by' indicates the answer is hidden within the clue.
'NORM' is hidden within 'man or machine'.

(Other definitions for norm that I've seen before include "Yardstick" , "Standard considered to be representative" , "Standard level of performance" , "'Standard, usual (4)'" , "Standard choice" .)

I've seen this clue in The Telegraph.

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