A word about Max (3)
I believe the answer is:
mad
'a word about max' is the definition.
I can't judge whether this defines the answer.
'a word about' is the wordplay.
'word' becomes 'md' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'about' is an insertion indicator.
'a' going into 'md' is 'MAD'.
Can you help me to learn more?
(Other definitions for mad that I've seen before include "Extremely foolish" , "Berserk" , "lunatic" , "Frantic" , "Roused to anger" .)