Divided affection between Charlie and Nick, initially (6)
I believe the answer is:
cloven
'divided' is the definition.
('cloven' can be similar in meaning to 'divided')
'affection between charlie and nick initially' is the wordplay.
'affection' becomes 'love' (I've seen this before).
'between' means one lot of letters goes inside another.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'and' means one lot of letters go next to another.
'initially' says to take the initial letters.
The first letter of 'nick' is 'n'.
'c'+'n'='cn'
'love' going inside 'cn' is 'CLOVEN'.
(Other definitions for cloven that I've seen before include "Split, like the devil's foot" , "Of hoof, divided like oxen" , "Cleft" , "Kind of hoof that is divided" , "Split (like some hoofs)" .)