At summer's end, the garden can be even finer (7)
I believe the answer is:
grander
'even finer' is the definition.
I can't tell whether this definition defines the answer.
'at summer's end the garden can be' is the wordplay.
'at' says to put letters next to each other.
'end' indicates one should take the final letters.
'can be' is an anagram indicator.
The final letter of 'summer' is 'r'.
'garden' is an anagram of 'grande'.
'r' put after 'grande' is 'GRANDER'.
Can you help me to learn more?
(Another definition for grander that I've seen is " more impressive".)