The most common and most likely answer to this crossword clue is the 3 letter word GAP
I've seen this crossword clue in Financial Times
G
A
P
More clues leading to the result GAP
- Doctor covering up a breach
- Opening article penned by doctor
- Something lacking in a student’s year
- Doctor saving a space
- Space is ultimately big and likely endless
- Area covered by doctor opening?
- Short part of book, uplifting passage
- Mike leaving umbrella in shop
- Opening gambit’s beginning with a pawn
- The difference we’re told to be wary of?
Buddy explains!

The straight part
We know that "break" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case break = gap.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 GAP mean?
GAP noun- An opening in anything made by breaking or parting.
- An opening allowing passage or entrance.
- An opening that implies a breach or defect.
- A vacant space or time.
- A hiatus, a pause in something which is otherwise continuous.
- A vacancy, deficit, absence, or lack.
- A mountain or hill pass.
- A sheltered area of coast between two cliffs (mostly restricted to place names).
- The regions between the outfielders.
- (for a medical or pharmacy item) The shortfall between the amount the medical insurer will pay to the service provider and the scheduled fee for the item.
- (usually written as "the gap") The disparity between the indigenous and non-indigenous communities with regard to life expectancy, education, health, etc.
- An unsequenced region in a sequence alignment.
- To notch, as a sword or knife.
- To make an opening in; to breach.
- To check the size of a gap.
- To leave suddenly.
- An elected head of a gewog in Bhutan.