Way to get out member sooner (3,6)

I believe the answer is:

leg before

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'way to get out' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'member sooner' is the wordplay.
'member' becomes 'leg' (member can mean a limb).
'sooner' becomes 'before' (I can't explain this - if you can you should believe this answer much more).
'leg'+'before'='LEG BEFORE'

Can you help me to learn more?

(Another definition for leg before that I've seen is " Way of being out at cricket".)

I've seen this clue in The Guardian.

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