Scurf (8)
I believe the answer is:
dandruff
'scurf' is the definition.
(I know that dandruff is a type of scurf)
This is the entire clue.
(Other definitions for dandruff that I've seen before include "Unsightly flakes of dead skin on scalp" , "Flakes over head" , "Unsightly flakes of dead skin in hair" , "Flaky complaint" , "Unsightly scalp scurf seen on clothes" .)