
1) Pest on a military assignment
Found on
https://www.crosswordclues.com/clue/mission-creep

Mission creep is the expansion of a project or mission beyond its original goals, often after initial successes. Mission creep is usually considered undesirable due to the dangerous path of each success breeding more ambitious attempts, only stopping when a final, often catastrophic, failure occurs. The term was originally applied exclusively to m...
Found on
http://en.wikipedia.org/wiki/Mission_creep

Originally applied to military operations, a gradual expansion of a project that goes beyond original aims, so things turn out differently than planned, often resulting in undesirable consequences
Found on
http://www.encyclo.co.uk/local/22643
No exact match found.