Crossword Genius

Leave out of room itself (4)

Ross

I believe the answer is:

omit

Here is my best explanation:

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

'of room itself' is the wordplay.
'of' says the answer is hidden in the clue.
'OMIT' is hidden in the letters of 'room itself'.

This clue was last seen in Mirror