Long timber (4)
I believe the answer is:
pine
This might be a double definition.
'long' is the first definition.
(to pine for someone is to long for them)
'timber' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
Can you help me to learn more?
(Other definitions for pine that I've seen before include "A tree to grieve for" , "Long - timber" , "type of wood" , "Coniferous tree" , "Long for the conifer?" .)