Do you long for such furniture? (4)
I believe the answer is:
pine
'do' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for pine that I've seen before include "Evergreen conifer" , "A tree to grieve for" , "type of wood" , "Tree, waste away" , "Conifer grown for wood" .)