Expert on body is the cause of hazy defensive vision perhaps? (9)
I believe the answer is:
anatomist
'expert on body' is the definition.
(anatomy is the study of the body)
'is the cause of hazy defensive vision perhaps?' is the wordplay.
I cannot really understand how this works, but
'is' is found in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'of' could be 'o' and 'o' is located in the answer.
This explanation may well be incorrect...
(Other definitions for anatomist that I've seen before include "one studies bodies" , "student of structure" , "Gray, for one" , "Expert in the structure of human and animal bodies" , "Structural expert" .)