Standard laid down for paving (4)

I believe the answer is:

flag

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This might be a double definition.

'standard' is the first definition.
(standard is a type of flag)

'laid down for paving' is the second definition.
'flag' can be an answer for 'paving' (thesaurus). I'm not certain of the 'laid down for' bit.

Can you help me to learn more?

(Other definitions for flag that I've seen before include "appearing to decline" , "Standard - paving-stone" , "part of pavement" , "Plant; paving slab" , "variety of plant" .)

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

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