Case of man who shouldn't be working with writer (8)
I believe the answer is:
scabbard
'case' is the definition.
(I've seen this before)
'man who shouldn't be working with writer' is the wordplay.
'man who shouldn't be working' becomes 'scab' (person refusing to join a strike).
'with' is a charade indicator (letters next to each other).
'writer' becomes 'bard' (bard is a kind of writer).
'scab'+'bard'='SCABBARD'
'of' is the link.
(Other definitions for scabbard that I've seen before include "Holding a weapon" , "Something to stick the knife into" , "Sheath for sword or dagger" , "It keeps food off clothes" , "Holder for a bladed weapon" .)