Screws up (4)

I believe the answer is:

errs

'screws up' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for errs that I've seen before include "Boobs" , "Goes astray" , "Makes mistakes" , "Slips up" , "Strays" .)

I've seen this clue in the Universal, the USA Today, The Wall Street Journal and the King Feature Syndicate.

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