Show fibre (4)
I believe the answer is:
hair
I believe this is a double definition.
'show' is the first definition.
(I've seen this before)
'fibre' is the second definition.
(I've seen this before)
(Other definitions for hair that I've seen before include "Whisker" , "Fibre; small extent" , "1960s' rock musical with nudity" , "shock" , "The American Tribal Love-Rock Musical (1967)" .)