Ale splashing — a keg ruined — because of this? (7)

I believe the answer is:

leakage

But I can't explain it at all!

(Other definitions for leakage that I've seen before include "Unwanted escape (eg of water or information)" , "Unintended escape (of fluid)" , "Gradual escape" , "Lake age (anag.)" , "Liquid/gas accidentally lost" .)

I've seen this clue in The Times.

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