'1812', for one, is bound to have noisy climax and corny bit (4,4)
I believe the answer is:
leap year
'have noisy climax and corny bit' is the definition.
I can't judge whether this definition defines the answer.
'1812 for one is bound' is the wordplay.
'y8ye' becomes 'year' (I can't explain this - if you can you should believe this answer much more).
'for' means one lot of letters go next to another (I've seen this in other clues).
'one is bound' becomes 'leap' (I've seen this before).
'year' after 'leap' is 'LEAP-YEAR'.
'to' is the link.
Can you help me to learn more?
(Other definitions for leap year that I've seen before include "366, not 365 days" , "Every fourth year" , "It contains an extra day" , "It has one extra day" , "Three hundred and sixty six - day period" .)