Not whom you wish to escort and not when (5,4)
I believe the answer is:
wrong date
'when' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'not whom you wish to escort and' is the wordplay.
I cannot quite understand how this works, but
'not' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
'escort' could be 'date' (escort can mean a date or partner) and 'date' is located in the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'not' is the link.
Can you help me to learn more?