Crossword Genius

Leak preventer (7)

Ross

I believe the answer is:

sealant

(Other definitions for sealant that I've seen before include "Material for plugging leaks" , "Substance for closing something tightly" , "Filler used to close a gap" , "Material blocking leaks" , "Material used for an airtight or watertight join" .)

I've seen this clue in The Sun.
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