Evasiveness (12)
I believe the answer is:
equivocation
'evasiveness' is the definition.
(synonyms)
This is all the clue.
(Other definitions for equivocation that I've seen before include "A beating about the bush" , "Evasiveness" , "Use of intentionally vague language" , "Use of doubtful words" , "Use of deliberately vague language" .)