Don't be afraid of everything terrifying (8)
I believe the answer is:
fearsome
'terrifying' is the definition.
(I've seen this before)
'don't be afraid of everything' is the wordplay.
I cannot quite understand how this works, but
'of' could be 'o' and 'o' is present in the answer.
'be afraid' could be 'fear' (I've seen this before) and 'fear' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for fearsome that I've seen before include "Dreadful" , "Frightening, terrible" , "Frightful" , "Terrifying" , "Awful" .)