The dread of all governesses and nannies? (6)
I believe the answer is:
terror
'the dread' is the definition.
(synonyms)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for terror that I've seen before include "Out-of-control child" , "State of great fright" , "rogue" , "Utter dread" , "Panicky fright" .)