Three, less companionable than two? (5)
I believe the answer is:
crowd
'two?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for crowd that I've seen before include "Social set" , "Masses" , "Army" , "Flock" , "Horde" .)