Crossword Genius

Makes watertight, say (5)

Ross

I believe the answer is:

seals

'makes watertight say' is the definition.
(making watertight is a kind of sealing)

This is all the clue.

(Other definitions for seals that I've seen before include "Fastens or closes securely" , "Marine mammals" , "Great swimmers" , "They make an impression" , "Makes waterproof" .)

I've seen this clue in The New York Times.
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