Crossword Genius

Ghost Detector Radar Camera on one's phone, e.g (3)

Ross

I believe the answer is:

app

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

I've seen this clue in The Washington Post.
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