Fear nerves must reveal cash job (6)
I believe the answer is:
earner
'cash job' is the definition.
(I've seen this before)
'fear nerves must reveal' is the wordplay.
'reveal' indicates the answer is hidden within the clue.
'EARNER' is hidden within 'fear nerves must'.
(Other definitions for earner that I've seen before include "One receiving income (for work)" , "Someone paid for work" , "Something bringing in money" , "Good job" , "One paid for work" .)