Late night time? (3)
I believe the answer is:
ten
'late night time?' is the definition.
'ten' can be an answer for 'time?' (I've seen this before). I am not certain of the 'late night' bit.
'late night time?' is the wordplay.
'late' says to take the final letters (I've seen 'latest of' mean this).
'time?' becomes 'en' (I can't explain this - if you can you should believe this answer much more).
The last letter of 'night' is 't'.
't'+'en'='TEN'
Can you help me to learn more?
(Other definitions for ten that I've seen before include "Very young" , "PM's address, Downing St" , "honour" , "Dudley Moore/Bo Derek film" , "No of sides of a decagon" .)