See National Guard provide weapons to far-reaching power (4,3)

I believe the answer is:

long arm

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'see national guard provide weapons' is the definition.
I can't tell whether this definition defines the answer.

'far-reaching power' is the wordplay.
'far-reaching' becomes 'long-' (I've seen this in another clue).
'power' becomes 'arm' (arm can mean power or strength).
'long'+'arm'='LONG ARM'

'to' is the link.

Can you help me to learn more?

(Other definitions for long arm that I've seen before include "Property of the law - made when stretching" , "range of powers" .)

I've seen this clue in The Guardian.

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