Compile a crossword collection (3)
I believe the answer is:
set
I believe this is a double definition.
'compile a crossword' is the first definition.
(crossword compilers set crosswords)
'collection' is the second definition.
(I know that set is a type of collection)
(Other definitions for set that I've seen before include "Ancient god" , "Mount (precious stone)" , "Solidified" , "Cake < , plonk < , something served" , "box?" .)