Undemanding job’s axed in firm (6)
I believe the answer is:
secure
'firm' is the definition.
(similar in meaning)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for secure that I've seen before include "Firmly in place - free from danger" , "Fix; safe" , "land" , "lock" , "Safe, protected" .)