The most common and most likely answer to this crossword clue is the 7 letter word AUGUSTS
A
U
G
U
S
T
S
Buddy explains!
The straight part
We know that "Parts of summer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case parts of summer = augusts.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does AUGUSTS mean?
AUGUSTS verb- To make ripe; ripen.
- To bring to realization.
- A kind of clown, usually serving as an anarchic foil to the whiteface.