Crossword Genius

Make airtight (4)

Ross

I believe the answer is:

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make airtight</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Times, The Mirror, the USA Today, the Universal, the Penny Press, the Newsday and The New York Times.
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