An 'alias' or 'nom-de-plume'.
-adjective 1. working or done out of public sight; secret: an undercover investigation. 2. engaged in spying or securing confidential information: an undercover agent.
The suffix is -er. The suffix is an action.
Another name for plateau is tableland.
It is an oesophagus
Another name for the sweetbriar is eglantine.
A spy, operative, undercover agent, sleeper, spook, mole.
SPY Ghosts Shadows (and for gamers) Splinter cell :} Fifth columnists
smith
undercover cruiser
Undercover
Peter Franks
saving grace - stellar revival
hiding in plain sight
Don't think so!
Lola loughnaggle
Beyond the law
" Oughta Know By Now."