Secretly enter (an organisation) (10)

I believe the answer is:

infiltrate

(Other definitions for infiltrate that I've seen before include "Worm one's way into" , "Sneak into" , "gradually sink in" , "Slowly and secretly gain access to (an organisation)" , "Enter undetected" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.