Almost all wood furniture is from the mountains (6)
I believe the answer is:
alpine
'from the mountains' is the definition.
'almost all wood furniture' is the wordplay.
'almost' means to remove the last letter (most of the word but not all of it).
'wood furniture' becomes 'pine'.
'all' with its last letter taken away is 'al'.
'al'+'pine'='ALPINE'
'is' acts as a link.
(Other definitions for alpine that I've seen before include "Relating to a European mountain range" , "seen in rocky state?" , "To do with great European mountains" , "Plant of high mountains" , "Native growing up in mountainous area" .)