Trainspotter, perhaps (4)
I believe the answer is:
nerd
(Other definitions for nerd that I've seen before include "Sort of chap" , "Studious bore" , "One lacking social skills" , "knowledgable geek" , "Irritating person (slang)" .)
I believe the answer is:
nerd
(Other definitions for nerd that I've seen before include "Sort of chap" , "Studious bore" , "One lacking social skills" , "knowledgable geek" , "Irritating person (slang)" .)