What you're told to get when you sneeze (7)
I believe the answer is:
atishoo
'sneeze' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for atishoo that I've seen before include "25 sound" , "Sneezing sound" , "report of involuntary escape from trap?" , "Sound of explosion" , "hay-fever sufferer may interject this" .)