Gossip with Charlie, mad man? (7)
I believe the answer is:
chatter
'gossip' is the definition.
(I know that gossip can be written as chatter)
'with charlie mad man?' is the wordplay.
'with' means one lot of letters go next to another.
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'mad man?' becomes 'hatter' (I've seen this in another clue).
'c' put next to 'hatter' is 'CHATTER'.
(Other definitions for chatter that I've seen before include "Gas" , "Insignificant talk" , "Rabbit on" , "Trivial conversation" , "Speak rapidly and incessantly" .)