Disfigure your head? That's creepy! (5)
I believe the answer is:
scary
'creepy' is the definition.
(I've seen this in another clue)
'disfigure your head?' is the wordplay.
'disfigure' becomes 'scar' (scarring is a kind of disfiguring).
'head?' suggests taking the first letters (I've seen 'heads of' mean this).
The first letter of 'your' is 'y'.
'scar'+'y'='SCARY'
'that's' acts as a link.
(Other definitions for scary that I've seen before include "[SPICE]" , "Frightening or spooky" , "Alarming, maybe paranormal" , "spook" , "Fearsome" .)