Far from private information! (3)
I believe the answer is:
gen
'information' is the definition.
(gen can informally mean information)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for gen that I've seen before include "opening book, in short" , "Info" , "'Information, colloquially (3)'" , "Informal information" , "Knowledge" .)