Malaise rare in report (7)
I believe the answer is:
boredom
'malaise' is the definition.
(thesaurus)
'rare in report' is the wordplay.
'rare' becomes 'red' (as in a red steak).
'in' means one lot of letters goes inside another.
'report' becomes 'boom' (both can mean a loud noise).
'red' going inside 'boom' is 'BOREDOM'.
(Other definitions for boredom that I've seen before include "Ennui in bedroom" , "no interest" , "weary idleness" , "Tedium, ennui" , "Overseers" .)