Crossword Genius

Without idling, not starting (7)

Ross

I believe the answer is:

lacking

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'without' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

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(Other definitions for lacking that I've seen before include "Being without, wanting" , "Missing" , "Short" , "Absent, deficient" , "Deficient or inadequate" .)

I've seen this clue in The Daily Express.
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