Useless forum for discussing work (7,4)
I believe the answer is:
talking shop
'discussing work' is the definition.
'talking shop' can be an answer for 'discussing' (talking shop is a kind of discussing). I'm unsure of the 'work' bit.
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for talking shop that I've seen before include "discussing business after hours" , "Parliament perhaps?" , "where nothing gets done?" , "Useless committee" , "place for discussion?" .)