Sentence:  ... but with only three other tables on the patio apart from myself – two three-<WSD>tops</WSD> and a five-<WSD>top</WSD> – it's hard to imagine what the holdup is. 
Meaning of the word marked with <WSD> tags:  (A table at which there is, or which has enough seats for) a group of a specified number of people eating at a restaurant.