The most common and most likely answer to this crossword clue is the 7 letter word QUANTUM
I've seen this crossword clue in Financial Times
Q
U
A
N
T
U
M
More clues leading to the result QUANTUM
- Theory that makes a sudden leap
- Question abnormal autumn amount
- Required amount in turn from government-funded body and corporation
- The tiniest bit gives a fashion designer hesitation
- Least possible amount – two pints, Cardinal replaces right with hesitation
- Spectacular advance perhaps, put man equal...
- Spectacular kind of physics
Buddy explains!

The straight part
We know that "amount" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case amount = quantum.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 QUANTUM mean?
QUANTUM noun- The total amount of something; quantity.
- The amount or quantity observably present, or available.
- The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon.
- A definite portion of a manifoldness, limited by a mark or by a boundary.
- A brief document provided by the judge, elaborating on a sentencing decision.
- The amount of time allocated for a thread to perform its work in a multithreaded environment.
- Of a change, sudden or discrete, without intermediate stages.
- Of a change, significant.
- Involving quanta, quantum mechanics or other aspects of quantum physics.
- Relating to a quantum computer.