Pester to rescind the dismissal (4,2)
I believe the answer is:
keep on
'pester' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how they can define each other.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for keep on that I've seen before include "Continue, persevere" , "Continue; not dismiss" , "Continue; retain in service" .)