One was even a boy (6)
I believe the answer is:
andrew
'a boy' is the definition.
'one was even' is the wordplay.
'one' becomes 'an' (an apple is one apple).
'was even' becomes 'drew' (scored evenly).
'an'+'drew'='ANDREW'
(Other definitions for andrew that I've seen before include "Peter's brother" , "Royal prince" , "holy man" , "November thirtieth is this saint's day" , "apostle" .)