He has a familiar name for a little girl (5)
I believe the answer is:
edwin
'he' is the definition.
(I've seen this before)
'a familiar name for a little girl' is the wordplay.
I cannot quite see how this works, but
'name' could be 'ed' (short for Edward) and 'ed' is found in the answer.
The remaining letters 'win' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'has' acts as a link.
Can you help me to learn more?
(Other definitions for edwin that I've seen before include "Fellow" , "English king" , "ancient king" , "and 19: Dickensian character" , "Anglo-Saxon King" .)