IPA: /ˈɡɒlfər/
KK: /ˈɡɔlfər/
A person who plays the sport of golf.
He is a skilled golfer who practices every weekend.
Golfer → The word is formed from "golf" (originating from Middle Dutch *kolf*, meaning club or bat) and "-er" (meaning a person who). A golfer is a person who plays the game of golf.
Think of someone who plays with a 'club' ('golf') — the '-er' just means a person. A golfer is someone who plays golf.