Crossword Genius

Possible sound of patient reporting a cleaner? (7)

Ross

I believe the answer is:

atishoo

I'm a little stuck... Click here to teach me more about this clue!

'possible sound' is the definition.
'atishoo' can be an answer for 'sound' (I have seen 'Sound of sneeze' mean 'atishoo' so perhaps 'sound' could also mean 'atishoo'). I'm unsure of the 'possible' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for atishoo that I've seen before include "hay-fever sufferer may interject this" , "Sudden eruption" , "Sound of explosion" , "25 sound" , "report of involuntary escape from trap?" .)

I've seen this clue in The Telegraph.
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