Elders apt to get drunk — very drunk (9)
I believe the answer is:
plastered
'very drunk' is the definition.
(I've seen this before)
'elders apt to get drunk' is the wordplay.
'to get drunk' indicates an anagram.
'elders'+'apt'='eldersapt'
'eldersapt' anagrammed gives 'PLASTERED'.
(Other definitions for plastered that I've seen before include "get soaked?" , "Drunk (slang)" , "Coated thickly, being slangily drunk" , "Might ceilings be" , "Pickled" .)