Lunch always includes this drink (3)
I believe the answer is:
cha
'this drink' is the definition.
(I've seen this before)
'lunch always includes' is the wordplay.
'includes' says the answer is hidden in the clue.
'CHA' is hidden within 'lunch always'.
(Other definitions for cha that I've seen before include "Tea (informal)" , "Rosie Lee (slang)" , "not allowed in ski lodge" , "Tea (colloq.)" , "Indian tea" .)