Colas I drunk contains vitamin energy cordial (8)
I believe the answer is:
sociable
'cordial' is the definition.
(thesaurus)
'colas i drunk contains vitamin energy' is the wordplay.
'drunk' is an anagram indicator.
'contains' indicates putting letters inside.
'vitamin' becomes 'b' (B is an example**).
'energy' becomes 'e' (physics symbol as in E=mc2).
'colas'+'i'='colasi'
'colasi' is an anagram of 'social'.
'social' going around 'b' is 'sociabl'.
'sociabl'+'e'='SOCIABLE'
(Other definitions for sociable that I've seen before include "Easy in company" , "Friendly - gregarious" , "Fond of others' company" , "Friendly and pleasant" , "Fond of mixing with others" .)