The most common and most likely answer to this crossword clue is the 7 letter word PIVOTAL
P
I
V
O
T
A
L
More clues leading to the result PIVOTAL
- Crucial US city to important figure, on reflection
- Important rising star oddly missing football
- Crucial one element of democracy’s curtailed in China
- Critical old celeb reviewed short story
- Critical comrade impounding four books
- Key foreign city in view of star on reflection
- Key US city closed with bigwig turning up
- Key friend retaining four books
- Four books kept by friend crucially important
- Rise in City of Angels, to celebrity, is important
Buddy explains!

The straight part
We know that "Key" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case key = pivotal.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 PIVOTAL mean?
PIVOTAL adjective- Of, relating to, or being a pivot.
- Being of crucial importance; central, key.