One keeps back shock career, not allowed to be spoken about (8)
I believe the answer is:
hairband
'career not allowed to be spoken about' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'one keeps back shock' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
'shock' could be 'hair' (shock can mean a mass of hair) and 'hair' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for hairband that I've seen before include "that keeps things tidy on top?" , "One may be going over the top" .)