Bar is made of wood completely (9)
I believe the answer is:
forestall
'bar' is the definition.
(thesaurus)
'wood completely' is the wordplay.
'wood' becomes 'forest' (synonyms).
'completely' becomes 'all' (synonyms).
'forest'+'all'='FORESTALL'
'is made of' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for forestall that I've seen before include "Thwart" , "Take action before" , "Hinder by anticipation" , "Prevent by taking advance action" , "Obstruct by taking advance action" .)