Crossword Genius

What finally made Lake Geneva empty out? (7)

Ross

I believe the answer is:

leakage

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'what finally made lake geneva empty out?' is the definition.
I can't tell whether this definition defines the answer.

'finally made lake geneva empty out?' is the wordplay.
'finally' indicates one should take the final letters.
'empty' says to hollow out the word (remove centre letters).
'out?' indicates an anagram (I've seen 'out' mean this (out can mean wrong or inaccurate)).
'geneva' with its middle removed is 'ga'.
The final letter of 'made' is 'e'.
'e'+'lake'+'ga'='elakega'
'elakega' is an anagram of 'LEAKAGE'.

Can you help me to learn more?

(Other definitions for leakage that I've seen before include "Fluid which escapes" , "Accidental loss of fluid" , "Unwanted discharge of fluid" , "Accidental escape (of a liquid or gas)" , "Liquid/gas accidentally lost" .)

I've seen this clue in The Telegraph.
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