Bury, but pause when before the mission (5)
I believe the answer is:
inter
'bury' is the definition.
(to inter is to put into the ground)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for inter that I've seen before include "get put down!" , "Set deep" , "Entomb" , "foreign footballers" , "Put under the earth" .)