Tell us all you know of fool meeting with success … (3,4,2)
I believe the answer is:
out with it
'tell us all' is the definition.
I can't tell whether this defines the answer.
'you know of fool meeting with success' is the wordplay.
I cannot quite understand how this works, but
'you' could be 'u' (commonly used in online communication) and 'u' is found in the answer.
'of' could be 'o' and 'o' is found within the answer.
'fool' could be 'twit' (both can mean a stupid person) and 'twit' is located in the answer.
'meeting' could be 'hit' (hit is a kind of meeting) and 'hit' is present in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for out with it that I've seen before include "Speak up" , "Demand for comment" , "Squeal" , "Tell me quickly" , "divulge information immediately!" .)