Very complicated (5)
I believe the answer is:
hairy
'very complicated' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hairy that I've seen before include "Perilous" , "Frightening - like a bear?" , "Having had a close shave? Not so" , "triggering alarm" , "like Esau" .)