It's depressing for a listener surrounded by what's uninteresting (6)
I believe the answer is:
'it's depressing' is the definition.
(I've seen this in another clue)
'a listener surrounded by what's uninteresting' is the wordplay.
'a listener' becomes 'ear' (body part which hears or listens).
'surrounded by' indicates putting letters inside.
'what's uninteresting' becomes 'dry' (I've seen this before).
'ear' inserted into 'dry' is 'DREARY'.
'for' is the link.
(Other definitions for dreary that I've seen before include "routine" , "Dark" , "Grey and dull" , "Bleak, depressing" , "Dismal, depressing" .)