Arranges carefully (4)
I believe the answer is:
sets
'arranges carefully' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sets that I've seen before include "Units of play in tennis" , "Plants" , "Groups of things of the same kind" , "Scenery etc. of dramatic productions" , "Major divisions of tennis match" .)