Crossword Genius

Airport acquisitions (6)

Ross

I believe the answer is:

stamps

(Other definitions for stamps that I've seen before include "Philatelists collect them" , "Imprints" , "Gummed receipts of postal fees" , "Brings foot heavily to the ground, as in anger" , "Philatelists study them" .)

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