Measure flag (8)

I believe the answer is:

standard

I believe this is a double definition.

'measure' is the first definition.
(I know that measure can be written as standard)

'flag' is the second definition.
(I know that standard is a type of flag)

(Other definitions for standard that I've seen before include "Flag - accepted level" , "Normal, average" , "Flag - of the usual kind" , "sort of lamp" , "Normal; flag" .)

I've seen this clue in The Telegraph and The Guardian.

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