Name of songbird, extremely large (5)
I believe the answer is:
title
'name' is the definition.
(eg the name of a book)
'songbird extremely large' is the wordplay.
'songbird' becomes 'tit' (tit is a type of songbird).
'extremely' suggests removing the centre (only the extremes of the word are used).
'large' with its centre taken out is 'le'.
'tit'+'le'='TITLE'
'of' is the link.
(Other definitions for title that I've seen before include "Championship -- form of address" , "Handle" , "Appellation signifying status or function" , "Lord, sir, doctor, for instance" , "Right to possession" .)