Mole, e.g. (3)
I believe the answer is:
spy
(Other definitions for spy that I've seen before include "Discover" , "Enemy agent" , "Watch covertly like secret agent" , "Glimpse" , "One gathers information surreptitiously" .)
I believe the answer is:
spy
(Other definitions for spy that I've seen before include "Discover" , "Enemy agent" , "Watch covertly like secret agent" , "Glimpse" , "One gathers information surreptitiously" .)