Extended weaponry of inordinate wealth and police power (4,3,2,3,3)

I believe the answer is:

long arm of the law

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'police power' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'extended weaponry of inordinate wealth' is the wordplay.
'extended' becomes 'long-' (similar in meaning).
'weaponry' becomes 'arm' (arm is a kind of weaponry).
'inordinate wealth' becomes 'thelaw' (I can't explain this - if you can you should believe this answer much more).
'long'+'arm'+'of'+'thelaw'='LONG ARM OF THE LAW'

'and' is the link.

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I've seen this clue in the Sydney Morning Herald.

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