Initials on entry visa erased the day before (3)
I believe the answer is:
eve
'day before' is the definition.
(the eve of something is the night before)
'initials on entry visa erased' is the wordplay.
'initials' becomes 'e' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'entry' says to take the initial letters (I've seen 'entry of' mean this).
The initial letters of 'visa erased' is 've'.
'e'+'ve'='EVE'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for eve that I've seen before include "She reportedly lived first" , "Lady of the previous night" , "See 13 Across" , "Previous day" , "Woman of Eden" .)