Crossword Genius

Lacking, but not for long (5)

Ross

I believe the answer is:

short

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'lacking' is the definition.
(to be short something is to lack it)

I can't explain the rest of the clue.

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(Other definitions for short that I've seen before include "Of small duration" , "Literary genre such as those by ..." , "Limited in duration" , "Neat" , "Not long enough" .)

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