Subject to circumstances, it could just be shifted 'left' to the end of the agenda and filibustered out of time so - it's entirely 'possible' to defer an item.
Whether it is 'ethical' or 'appropriate' would depend upon the circumstances. You'd be unlikely to land an effective challenge to an item being deferred since either the chair or some consenting party could just suggest that they need more detail or information and that would justify deferment.
Very dependent upon the circumstance and the sensitivity of the subject item.