Crossword Genius

Maxim used by SAS, as her windows smashed (3,5,4)

Ross

I believe the answer is:

who dares wins

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'maxim used by sas' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'as her windows smashed' is the wordplay.
'smashed' indicates an anagram.
'as'+'her'+'windows'='asherwindows'
'asherwindows' is an anagram of 'WHO DARES WINS'.

Can you help me to learn more?

(Another definition for who dares wins that I've seen is " SAS motto".)

I've seen this clue in The Independent.
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