The most common and most likely answer to this crossword clue is the 8 letter word SPACEBAR
S
P
A
C
E
B
A
R
More clues leading to the result SPACEBAR
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 = spacebar.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 SPACEBAR mean?
SPACEBAR noun- A key, in the shape of a bar, near the bottom of a keyboard, that generates a space character when pressed