Like some leaves — last bits of the autumn put in box (7)
I believe the answer is:
crenate
'like some' is the definition.
I can't judge whether this defines the answer.
'last bits of the autumn put in box' is the wordplay.
'last bits of' says to take the final letters.
'put in' means one lot of letters goes inside another.
'box' becomes 'crate' (crate is a kind of box).
The last letters of 'the autumn' are 'en'.
'en' placed into 'crate' is 'CRENATE'.
'leaves' acts as a link.
Can you help me to learn more?
(Another definition for crenate that I've seen is " notched edge".)