Being edgy, means nothing to father! (4)
I believe the answer is:
dado
'being edgy means nothing to father' is the definition.
I can't tell whether this definition defines the answer.
'nothing to father' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'to' means one lot of letters go next to another (I've seen this in other clues).
'father' becomes 'dad' (informal term for father).
'o' after 'dad' is 'DADO'.
Can you help me to learn more?
(Other definitions for dado that I've seen before include "Low wall panel" , "Decorative wall border" , "Lower section of wall in room" , "Panelled lower part of a wall" , "Decorated lower part of an interior wall" .)