Apathy in bedroom: that's terrible (7)
I believe the answer is:
boredom
'apathy' is the definition.
(thesaurus)
'bedroom that's terrible' is the wordplay.
'that's terrible' indicates an anagram.
'bedroom' with letters rearranged gives 'BOREDOM'.
'in' is the link.
(Other definitions for boredom that I've seen before include "Overseers" , "Feeling" , "Mental state" , "weary idleness" , "Monotony" .)