Geeks right to punch Celtic hooligans (5)
I believe the answer is:
nerds
'geeks' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for nerds that I've seen before include "Boringly studious types" , "Boringly studious people" , "Geeks" , "They can be boringly studious, perhaps lacking social skills" , "People considered boring because of obsessive hobbies or narrow solitary interests" .)