Extra starters from waiter in diner eventually (4)
I believe the answer is:
wide
'extra' is the definition.
(cricket term)
'starters from waiter in diner eventually' is the wordplay.
'starters from' suggests taking the first letters.
The initial letters of 'waiter in diner eventually' is 'WIDE'.
(Other definitions for wide that I've seen before include "Broad; cricket delivery" , "Spacious; an extra" , "(At cricket) an extra" , "Expansive" , "roomy" .)