Prepares collections (4)
I believe the answer is:
sets
I believe this is a double definition.
'prepares' is the first definition.
('set' can be a synonym of 'prepare')
'collections' is the second definition.
(set is a kind of collection)
(Other definitions for sets that I've seen before include "Hardens" , "Groups of things of the same kind" , "Scenery etc. of 11 across productions" , "Coagulates" , "Classes" .)