What a whiz of a quiz it is

This is a variation of a quiz I gave in 2009.  Last time you had to match definitions with mystery authors.  This time you have to match them with characters.  For example, if I wrote A garden implement or a private detective you would respond Dashiell Hammett's Sam SPADE.
 
But be warned.  It doesn't have to be the most obvious definition.  I could have said A playing card for SPADE..

The answers are in alphabetical order by the author's name.  Answers next week.

1 A type of mustard, or a priest.

2 A wetland, or an English Professor. 
3 A school of Buddhism or a Roman cop.
4 A type of hole, or a Seattle private eye. 
5 A child's transportation device, or a Detroit private eye.
6 A financial instrument, or a spy. 
7 A boatman, or a Seattle private eye.
8 A builder in stone, or an attorney. 
9 An adverb or a British police inspector
10 A shirt size or a clergyman. 
11 Cheerful, or a British spy.
12 An expert with an ancient weapon, or a private detective. 
13 A state capital, or a British police inspector.
14 A playing card, or an amateur detective 
15 A part of the face, or a New York City private eye.
16 A greeting card, or a gambling consultant. 
17 A circular water movement or an Akron private eye.
18 Something bestowed, or a British Inspector.