Gradual loss of fluid from pipework, eg (7)

I believe the answer is:

leakage

(Other definitions for leakage that I've seen before include "Discharge of fluid through a small gap" , "Unwanted discharge of fluid" , "Escape of liquid - or private information" , "Gradual escape" , "Liquid/gas accidentally lost" .)

I've seen this clue in The Times.

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