Put it down to, which is characteristic (9)
I believe the answer is:
attribute
This clue might be a double definition.
'put it down to which' is the first definition.
'attribute' can be an answer for 'put' (thesaurus). I am not sure about the rest of the definition.
'is characteristic' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for attribute that I've seen before include "An inherent quality" , "Assign" , "Credit - property" , "A special characteristic" , "Quality, feature" .)