Boy's name very recently entered (6)
I believe the answer is:
justin
'boy's' is the definition.
(I've seen this before)
'name very recently entered' is the wordplay.
I cannot really understand how this works, but
'name' could be 'n' (common abbreviation e.g. on forms) and 'n' is present in the answer.
'recently' could be 'just' (I've seen this before) and 'just' is found within the answer.
A single letter 'i' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for justin that I've seen before include "Boy's name" , "-- Timberlake, singer" , "Boy" .)