Quality arousing pity (6)
I believe the answer is:
pathos
'quality arousing pity' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for pathos that I've seen before include "The quality moves one to pity" , "feeling of pity" , "Quality eliciting pity and sympathy" , "A quality that arouses pity or sorrow" , "Hot spa (anag) - sadness" .)