Novel chap's speciality power boat (9,4)
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I believe the answer is:
mansfield park
'novel' is the definition.
(novel by Jane Austen)
'chap's speciality power boat' is the wordplay.
'chap's' becomes 'mans' (chap can mean a man).
'speciality' becomes 'field' (the field or sphere someone works in).
'power' becomes 'p' (symbol in physics).
'boat' becomes 'ark' (ark is a kind of boat).
'mans'+'field'+'p'+'ark'='MANSFIELD PARK'
(Other definitions for mansfield park that I've seen before include "work" , "Book by Jane Austen" , "Jane Austen novel" .)