Funny thing, it's way above what is the best (6)
I believe the answer is:
scream
'funny thing' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'way above what is the best' is the wordplay.
I cannot quite see how this works, but
'way' could be 's' (Compass direction - South) and 's' is found within the answer.
'best' could be 'cream' (as in 'the cream of the crop') and 'cream' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for scream that I've seen before include "Piercing yell" , "Riot" , "Shout" , "A long piercing cry as of terror" , "'Sharp, piercing cry (6)'" .)