Are ignorant of the fact that you're no friend of (4,4)
I believe the answer is:
dont know
'are ignorant' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'of the fact that you're no friend of' is the wordplay.
I cannot really see how this works, but
'of' could be 'o' and 'o' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
'no' could be 'o' (O resembles 0) and 'o' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for dont know that I've seen before include "One undecided" , "Uncommitted voter" , "One giving (pollster) no opinion" .)