Ticks over icons on mobile? (5)

I believe the answer is:

idles

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'ticks over' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for idles that I've seen before include "Does little, just ticks over" , "Avoids working" , "Of engine, just ticks over in neutral" , "Spends time doing nothing" , "Lazes about, just ticks over" .)

I've seen this clue in The Independent.

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