Starter #2 from menu missing in order: phone inn, of course! (6,5,4)
I believe the answer is:
french onion soup
'starter 2 from menu missing' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'order phone inn of course' is the wordplay.
I cannot really understand how this works, but
'order' could be 'o' (abbreviation e.g. in British honours OM, OBE etc.) and 'o' is present in the answer.
'of' could be 'o' and 'o' is present in the answer.
an anagram of 'inn' is 'nin' which is located in the remaining letters.
'course' could be 'soup' (I've seen this before) and 'soup' is found in the answer.
The remaining letters 'french' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'in' is the link.
Can you help me to learn more?
(Another definition for french onion soup that I've seen is " A starter, perhaps".)