Book, one written with love? (3)
I believe the answer is:
bio
'book one written with love?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'book one written with love?' is the wordplay.
'book' becomes 'b' (abbreviation for book).
'one' becomes 'i' (Roman numeral).
'written with' says to put letters next to each other.
'love?' becomes 'o' (love means zero in tennis).
'b'+'i'+'o'='BIO'
Can you help me to learn more?
(Other definitions for bio that I've seen before include "Life story (abbr)" , "Prefix denotes living things" , "Prefix denoting life" , "life described in print" , "Prefix denotes life" .)