The most common and most likely answer to this crossword clue is the 3 plus 2 letter word RUN UP
I've seen this crossword clue in The Times
R
U
N
U
P
More clues leading to the result RUN UP
- Ladder positioned vertically, build quickly
- Quickly produce ladder, going where?
- Accumulate work at university
- Raised with sort of hoist
- Quickly make approach to jumping-off point
- Hurriedly produce ladder – having climbed it?
- Approach made quickly
- Hastily mend top of net after game at university
- Raise the standard in course at university
- Hoist ladder at university
Buddy explains!

The straight part
We know that "Quickly produce" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quickly produce = run up.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 RUN UP mean?
RUN UP noun- The approach run of a bowler before delivering the ball
- The approach run of a high jumper or other athlete in order to gather speed or momentum
- A period of time just before an important event.
- An increase in the value or amount of something