Late afternoon is when one's scheduled to drive off reportedly (7)
I believe the answer is:
teatime
'late afternoon' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'when one's scheduled to drive off reportedly' is the wordplay.
I cannot really see how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
'one's' could be 'im' ('one is' is a formal way of saying 'I am') and 'im' is found within the answer.
'reportedly' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
The remaining letters 'tat' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'is' acts as a link.
Can you help me to learn more?
(Other definitions for teatime that I've seen before include "When to serve scones?" , "Afternoon meal period" , "When cake might be had" , "Eat item (anag.)" , "4pm perhaps?" .)