Job quiet one put off (8)
I believe the answer is:
postpone
'put off' is the definition.
(I know that put off can be written as postpone)
'job quiet one' is the wordplay.
'job' becomes 'post' (post is a kind of job).
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'post'+'p'+'one'='POSTPONE'
(Other definitions for postpone that I've seen before include "Put off till later" , "Put off till another time" , "'Hold over, defer (8)'" , "'Put off, delay (8)'" , "Put off, defer" .)