Overt rookie’s trespassing of covert area (6)
I believe the answer is:
public
'overt' is the definition.
(associated in meaning)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for public that I've seen before include "Relating to the general community" , "School or house" , "In open view" , "Overt" , "Members of the community in general" .)