IPA: /ˈkrɪkɪtə/
KK: /ˈkrɪkɪtər/
A person who plays the sport of cricket.
He is a talented cricketer who has played for the national team.
Cricketer is formed from "cricket" (from Middle English *cricquet*, meaning a game played with a bat and ball) and "-er" (meaning a person who). A cricketer is a person who plays the game of cricket.
Think of someone who plays the game of cricket — the word 'cricketer' combines the game name with '-er' to indicate a person.