Charlie, going further back, becoming more distant (6)
I believe the answer is:
colder
'more distant' is the definition.
('cold' can be similar in meaning to 'distant')
'charlie going further back' is the wordplay.
'charlie' becomes 'C' (phonetic alphabet: alpha, bravo, charlie etc.).
'going further back' becomes 'older' (further back in time).
'c'+'older'='COLDER'
'becoming' acts as a link.
(Other definitions for colder that I've seen before include "Less warm" , "Of a lower temperature" , "Not so hot" , "More nippy" .)