Fed up with committee, by the sound of it (5)
I believe the answer is:
bored
'fed up' is the definition.
(fed up can mean bored)
'committee by the sound of it' is the wordplay.
'committee' becomes 'board' (board is a kind of committee).
'by the sound of it' shows a homophone (sound like).
'board' sounds like 'BORED'.
'with' acts as a link.
(Other definitions for bored that I've seen before include "World-weary" , "Fed up - tired of the world" , "Extremely uninterested" , "Disaffected" , "Feeling weary and uninterested" .)