Writer of new book about India (3)
I believe the answer is:
nib
'writer' is the definition.
(something which writes)
'new book about india' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'book' becomes 'b' (abbreviation for book).
'about' says to put letters next to each other.
'india' becomes 'i' (phonetic alphabet: alpha, bravo, charlie etc.).
'b' put after 'i' is 'ib'.
'n'+'ib'='NIB'
'of' is the link.
(Other definitions for nib that I've seen before include "Point of an old-fashioned pen" , "Writing point of old pen" , "Writing tip of old pen" , "Part of a fountain pen" , "writer" .)