The most common and most likely answer to this crossword clue is the 5 letter word TRICE
I've seen this crossword clue in The Times
T
R
I
C
E
More clues leading to the result TRICE
- Star circle oddly ignored for moment
- He leaves the grain for a moment
- Instant alternative to potatoes, on time?
- This sec last? It’s confused with claret maybe
- Flash group of people, born to be Conservative
- Second knight leaving cards won by earl
- Tennis’s beginning on grass in a moment
- A Lloyd Webber’s partner for a short while
- A Lloyd Webber’s ex-partner’s flash
- A Lloyd Webber’s partner’s moment?
Buddy explains!

The straight part
We know that "Instant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instant = trice.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 TRICE mean?
TRICE verb- To pull, to pull out or away, to pull sharply.
- To drag or haul, especially with a rope; specifically to haul or hoist and tie up by means of a rope.
- Now only in the phrase in a trice: a very short time; an instant, a moment.
- A pulley, a windlass.