Crossword Genius

Restaurant starter, informally

Ross

I believe the answer is:

app

'restaurant starter informally' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for app that I've seen before include "Software program for a mobile device" , "bit of software" , "Program for a smart phone, in short" , "Software item" , "Software for mobile devices, in short" .)

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