Book house by ocean (5)
I believe the answer is:
hosea
'book' is the definition.
(book of the Hebrew Bible)
'house by ocean' is the wordplay.
'house' becomes 'ho' (abbreviation for house).
'by' means one lot of letters go next to another.
'ocean' becomes 'sea' (synonyms).
'ho'+'sea'='HOSEA'
(Other definitions for hosea that I've seen before include "bookmaker" , "Good book" , "Book writer" , "Book of prophecies" , "OT prophet/book" .)