Back inside daily void - depressing! (6)
I believe the answer is:
dreary
'depressing' is the definition.
(I've seen this in another clue)
'back inside daily void' is the wordplay.
'back' becomes 'rear' (something's rear is its back).
'inside' indicates putting letters inside.
'void' says to hollow out the word (remove centre letters) (the word is empty or void of its inside letters).
'daily' with its middle removed is 'dy'.
'rear' going inside 'dy' is 'DREARY'.
(Other definitions for dreary that I've seen before include "Bleak, depressing" , "Overcast" , "Gloomy and dismal" , "Drab and dismal" , "avoiding exciting stuff" .)