Crossword Genius

'Five Go Off To Be Sick'? Leave it out! (4)

Ross

I believe the answer is:

omit

'leave it out' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for omit that I've seen before include "Leave out or undone" , "Drop" , "Fail (to do something)" , "Exclude - neglect" , "Miss out" .)

I've seen this clue in The Independent.
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