Stiff hair (4)
'stiff hair' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bristle that I've seen before include "Get angry" , "A stiff hair on chin" , "A short stiff hair, as in beard" , "Whisker" , "Look angry" .)
(Other definitions for whisker that I've seen before include "Hair's breadth" , "Long stiff hair, of a cat say" , "Long facial hair" , "Coarse hair" , "narrow margin" .)
'stiff hair' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for seta that I've seen before include "bristle-like appendage" , "bristle" , "Criminals make the best detectives" .)