Measure shields for some infantry regiments (4,6)

I believe the answer is:

foot guards

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'measure shields' is the definition.
The definition suggests a singular noun which matches the answer.

'some infantry regiments' is the wordplay.
'some infantry' becomes 'foot' (foot soldiers).
'regiments' becomes 'guards' (I am not sure about this - if you are sure you should believe this answer much more).
'foot'+'guards'='FOOT GUARDS'

'for' acts as a link.

Can you help me to learn more?

(Another definition for foot guards that I've seen is " British infantry regiments".)

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