"Bless you!" elicitor (6)
I believe the answer is:
sneeze
'bless you elicitor' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sneeze that I've seen before include "What Achillea ptarmica might induce" , "Involuntary expiration through the nose" , "I'm blessed if I do!" , "See Zen at the sign of a cold" , "Symptom of cold" .)