Crossword Genius

Some exploit ertswhile lags (7)

Ross

I believe the answer is:

loiters

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'lags' is the definition.

I don't understand how the remainder of the clue works.

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(Other definitions for loiters that I've seen before include "Waits idly" , "Hangs about with toilers" , "Fails to move on" , "Hangs about idly" , "dawdles" .)

I've seen this clue in The Independent.
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