Crossword Genius

One disclosing strength of alcohol, able to resist a splash (11)

Ross

I believe the answer is:

showerproof

I'm a little stuck... Click here to teach me more about this clue!

'alcohol able to resist a splash' is the definition.
I can't tell whether this defines the answer.

'one disclosing strength' is the wordplay.
'one disclosing' becomes 'shower' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'strength' becomes 'proof' (I've seen this before).
'shower'+'proof'='SHOWERPROOF'

'of' is the link.

Can you help me to learn more?

(Other definitions for showerproof that I've seen before include "resistant to downfall" , "safe from the rain" , "Resistant to light rain" , "like Mac?" .)

I've seen this clue in The Times.
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