Job-related invasion extremely awful (12)
I believe the answer is:
occupational
'job-related' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for occupational that I've seen before include "in the post?" , "To do with work" , "Sort of hazard" , "Relating to one's job or profession" , "concerned with employment" .)