Crossword Genius

“Spring having sprung”, omits (6,3)

Ross

I believe the answer is:

leaves out

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'omits' is the definition.
('leave out' can be a synonym of 'omit')

I can't explain the rest of the clue.

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(Other definitions for leaves out that I've seen before include "evidence that spring has arrived?" , "Excludes" , "Overlooks" .)

I've seen this clue in the Evening Standard.
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