Woody is on glue, smashed (8)
I believe the answer is:
ligneous
'woody' is the definition.
('ligneous' can be similar in meaning to 'woody')
'is on glue smashed' is the wordplay.
'smashed' is an anagram indicator.
'is'+'on'+'glue'='isonglue'
'isonglue' anagrammed gives 'LIGNEOUS'.
(Other definitions for ligneous that I've seen before include "Made of wood" , "Wooden" , "Of the nature of wood" , "Woody" .)