Difficulty keeping pledge of secrecy about folly (7)
I believe the answer is:
madness
'folly' is the definition.
(I know that folly can be written as madness)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for madness that I've seen before include "Lunacy - ska/pop band" , "Folly" , "Utter foolishness" , "Insanity" , "fury" .)