Crossword Genius

Long grass totally pointless (4)


I believe the answer is:


'long' is the definition.
(to long or itch for something is to desire it)

I don't understand the remainder of the clue.

(Other definitions for itch that I've seen before include "Tickle; urge" , "A nagging desire" , "Constant desire" , "Tickling sensation of skin" , "source of irritation" .)

I've seen this clue in The Guardian.
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