Room divider (4)
'room divider' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for screen that I've seen before include "Divider to select for suitability." , "Block out" , "Test or examine for the presence of disease or infection" , "Mask" , "Partition; monitor" .)
'room divider' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for wall that I've seen before include "Barrier, internal or external" , "Built barrier" , "Boundary of brick or stone" , "Side of building" , "Vertical divider or support" .)