Social institutions - there are thirteen of them (5)
I believe the answer is:
clubs
'social institutions' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Maybe there's a link between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for clubs that I've seen before include "Societies" , "Card suit" , "Suit (in cards)" , "cabarets" , "black suit" .)