Clue good being placed in wrong job (8)
I believe the answer is:
signpost
'clue' is the definition.
(I've seen this before)
'good being placed in wrong job' is the wordplay.
'good' becomes 'g' (abbreviation).
'being placed in' is an insertion indicator (I've seen this in other clues).
'wrong' becomes 'sin' (wrong can mean a sin or crime).
'job' becomes 'post' (post is a kind of job).
'g' going into 'sin' is 'sign'.
'sign'+'post'='SIGNPOST'
(Other definitions for signpost that I've seen before include "Direction pointer" , "Wayside indicator" , "Direction marker" , "Clue" , "director" .)