Meeting judge: primarily, purpose is to dismiss fine (8)
I believe the answer is:
junction
'meeting' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for junction that I've seen before include "Meeting (of roads, etc)" , "meeting-place" , "that may have box on either side" , "Motorway exit" , "Where roads meet" .)