Nauseous (3)
'nauseous' is the definition.
(I know that nauseous can be written as queasy)
This is the entire clue.
(Other definitions for queasy that I've seen before include "Unsettled" , "Feeling slightly sick, maybe with indigestion" , "Squeamish - nauseous" , "Ailing" , "Feeling nauseous" .)
(Other definitions for ill that I've seen before include "Shakespeare: '. . . met by moonlight'" , "In bad health" , "Sickly" , "state of America" , "Under the weather" .)