Shame about TV detective (7)
I believe the answer is:
remorse
'shame' is the definition.
(thesaurus)
'about tv detective' is the wordplay.
'about' becomes 're' (regarding).
'tv detective' becomes 'morse' (I've seen this before).
're'+'morse'='REMORSE'
(Other definitions for remorse that I've seen before include "Sorrow for wrong committed" , "Pangs of conscience" , "Penitence" , "Pity" , "display of conscience" .)