Two orders for starters have a lot of dates perhaps (2,6)
I believe the answer is:
go steady
'two orders for starters' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'a lot of dates perhaps' is the wordplay.
'a lot' becomes 'go' (I can't justify this - if you can you should believe this answer much more).
'of' indicates anagramming the letters (the answer comes from or 'of' the letters).
'perhaps' becomes 'y' (I've seen this in other clues).
'dates' anagrammed gives 'stead'.
'go'+'stead'+'y'='GO STEADY'
'have' is the link.
Can you help me to learn more?
(Other definitions for go steady that I've seen before include "See someone regularly" , "Keep seeing each other" , "Date one person regularly" , "Court romantically" , "Have relationship as regular boy or girl friend - sounds stable" .)