Crossword Genius

Make watertight (5)

Ross

I think it could be either:

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4

5

caulk

'make watertight' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for caulk that I've seen before include "Make boat waterproof by filling seams" , "Make watertight by sealing joints or seams" .)

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