Small restaurant includes new meal (6)
I believe the answer is:
dinner
'meal' is the definition.
(dinner is a kind of meal)
'small restaurant includes new' is the wordplay.
'small restaurant' becomes 'diner' (I've seen this before).
'includes' indicates putting letters inside.
'new' becomes 'n'.
'diner' placed around 'n' is 'DINNER'.
(Other definitions for dinner that I've seen before include "Repast" , "one making a row?" , "grub" , "serving in 20 [MESS] ?" , "Evening meal" .)