Teachers after a job - they allow no slacking (11)
I believe the answer is:
taskmasters
'they allow no slacking' is the definition.
The definition suggests an adverb but the answer is not.
'teachers after a job' is the wordplay.
'teachers' becomes 'masters' (old word for teachers).
'after' means one lot of letters go next to another.
'a job' becomes 'task' (synonyms).
'masters' put after 'task' is 'TASKMASTERS'.
Can you help me to learn more?
(Another definition for taskmasters that I've seen is " Hard bosses".)