Hurried up after house discussion group (7)
I believe the answer is:
seminar
'discussion group' is the definition.
(I've seen this before)
'hurried up after house' is the wordplay.
'hurried' becomes 'ran' (running is a kind of hurrying).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'after' means one lot of letters go next to another.
'house' becomes 'semi' (I've seen this before**).
'ran' back-to-front is 'nar'.
'nar' put after 'semi' is 'SEMINAR'.
(Other definitions for seminar that I've seen before include "Training meeting" , "Academic class" , "Working meeting in College" , "workshop" , "University discussion" .)