Boy's name very recently entered (6)
I believe the answer is:
justin
'boy's name' is the definition.
(I've seen this before)
'recently entered' is the wordplay.
'recently' becomes 'just' (I've seen this before).
'entered' becomes 'in' (I am not sure about this - if you are sure you should believe this answer much more).
'just'+'in'='JUSTIN'
'very' acts as a link.
Can you help me to learn more?
(Other definitions for justin that I've seen before include "Boy's name" , "-- Timberlake, singer" , "Boy" .)