Crossword Genius

Make airtight (4)

Ross

I believe the answer is:

'make airtight' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for seal that I've seen before include "Mammal seen swimming" , "Sea-dweller can produce a wax impression" , "making an impression" , "Bull or cow" , "Secure against leakage" .)

I've seen this clue in the Penny Press, The New York Times, the USA Today, the Newsday, The Mirror and The Times.
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