Electronic device chosen, sorted boxes (6)
I believe the answer is:
sensor
'electronic device' is the definition.
(I've seen this in another clue)
'chosen sorted boxes' is the wordplay.
'boxes' indicates the answer is hidden within the clue (to box can mean to contain).
'SENSOR' is hidden in the letters of 'chosen sorted'.
(Other definitions for sensor that I've seen before include "Detection device" , "A furtive look" , "Detector" , "One detects" , "device to detect change?" .)