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1a person who writes or has written something.
4a physician
5person skilled in woodwork
8a male member of a police force.
9the seller in a sale, esp. of property
12a waiter or waitress
14a person who sings
17a person who runs or cultivates a farm.
18an instructor or trainer in sport
19a person who writes plays.

2a person who teaches, esp. in a school
3a person who drives a vehicle
6a person who fits and repairs the apparatus of a water supply, heating, etc.
7a person, esp. a woman, who makes clothes professionally
8a man who is employed to deliver and collect letters etc.
10a person trained to care for the sick or infirm
11a silly, foolish, or playful person
13a person who acts a part in a play etc
15a dealer in food and household provisions
16a men's hairdresser.