The most common and most likely answer to this crossword clue is the 4 letter word ZOOM
Z
O
O
M
More clues leading to the result ZOOM
- Unknown character reflecting low buzzing sound
- Rush to animal park before the end of term
- Animals, millions, making loud continuous buzzing noise
- Fly over low zone
- Enlarge animal park before first of March
- Where animals are held captive, months go very fast
- Shoot reserve, male
- Quickly shift unruly kids, possibly by end of term
- Go with high 11, masked swordsman chucking out bishop at mass
- Merseyside’s first safari park starting to change focus rapidly
Buddy explains!

The straight part
We know that "Quickly shift" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quickly shift = zoom.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 ZOOM mean?
ZOOM verb- To communicate with someone using the Zoom videoconferencing software.
- A humming noise from something moving very fast
- A quick ascent
- A big increase
- An augmentation of a view
- To move fast with a humming noise
- To fly an airplane straight up
- To move rapidly
- To go up sharply
- To change the focal length of a zoom lens
- (used with in or out) to manipulate a display so as to magnify or shrink it
- Representing a humming sound
- Suggesting something moving quickly
- Suggesting a sudden change, especially an improvement or an increase