Days before included in manifests (7)
I believe the answer is:
evinces
'manifests' is the definition.
(I've seen this in another clue)
'days before included' is the wordplay.
'days' becomes 'eves' (eve is a kind of day).
'before' becomes 'inc' (I can't explain this - if you can you should give a lot more credence to this answer).
'included' indicates putting letters inside.
'eves' going around 'inc' is 'EVINCES'.
'in' acts as a link.
Can you help me to learn more?
(Another definition for evinces that I've seen is " Clearly shows".)