Biblical character represents Adam oddly, and Charlie (5)
I believe the answer is:
isaac
'biblical character' is the definition.
(Old Testament figure)
'represents adam oddly and charlie' is the wordplay.
'represents' becomes 'is' (eg a symbol represents or 'is' something else).
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'and' says to put letters next to each other.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
The alternating letters of 'adam' are 'aa'.
'is'+'aa'+'c'='ISAAC'
(Other definitions for isaac that I've seen before include "& 17 Down SF author" , "-- Asimov, sci-fi author" , "Esau's father" , "Father of 21" , "According to the book, twins' dad" .)