빈자리가

an empty seat

→ 빈자리
phrase Rare #28,447
an empty seat 빈자리 can also mean an empty spot or vacancy; 가 marks it as the subject of the sentence.
KO: 버스에 빈자리가 있어요.
EN: There’s an empty seat on the bus.

가운데에 빈자리가 있는 방법은 특히 이상했다.

The method with an empty space in the middle was especially strange.

오늘 중요한 일이 있었어요 아직 빈자리가 안 나왔어요 좀 있으면 날 것 같아요

Something important happened today. There still aren’t any openings, but I think one will come up soon.

— 토니 에드만 (2016)