Crossword Genius

Letters at the bottom of an invitation card (4)

Ross

I believe the answer is:

rsvp

(Other definitions for rsvp that I've seen before include "Can you come to the party?" , "Notation meaning answer the invitation" , "Kindly answer!" , "Please answer the invitation, monsieur" , "Brief request to acknowledge invitation" .)

I've seen this clue in The Guardian.
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