Like fluorescent paint (3-3)

I believe the answer is:

day-glo

(Other definitions for day-glo that I've seen before include "Of a luminously bright colour" , "Fluorescent colouring" , "Of a luminously brilliant green, yellow, pink, or orange." , "Fluorescent colour" , "Fluorescent (paint)" .)

I've seen this clue in the Sydney Morning Herald.

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