Good point that hurt, filling time unoccupied (6)
I believe the answer is:
touche
'good point' is the definition.
(touche can be said to acknowledge a good point)
'that hurt filling time unoccupied' is the wordplay.
'that hurt' becomes 'ouch' (I've seen this in other clues).
'filling' indicates putting letters inside.
'unoccupied' means to remove the middle letters (remove the inside letters which occupy the word).
'time' with its middle removed is 'te'.
'ouch' placed within 'te' is 'TOUCHE'.
(Other definitions for touche that I've seen before include "Fencing cry" , "Fencer's shout" , "Acknowledgment of a hit in fencing" , "Acknowledgement of fencing hit or valid criticism" , "cry from fencer" .)