The most common and most likely answer to this crossword clue is the 8 letter word FOUNTAIN
I've seen this crossword clue in The Guardian
F
O
U
N
T
A
I
N
More clues leading to the result FOUNTAIN
- Infant dancing across old university water feature
- With backing of UN, volunteer soldiers in jet
- Fan out when dancing in spring
- Fine high hilltop’s not visible in spring
- Spurt from female ousting male in spectacular rise
- Spring elevation before 13
- Well, peak with sex change?
- Spring in France — nation rioting, university seized
- UK ministry, talking shop with its counterparts, will meet volunteers in spring
- UN brought in if Nato scrambled jet
Buddy explains!

The straight part
We know that "Well" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case well = fountain.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 FOUNTAIN mean?
FOUNTAIN noun- A natural source of water; a spring.
- An artificial, usually ornamental, water feature (usually in a garden or public place) consisting of one or more streams of water originating from a statue or other structure.
- The structure from which an artificial fountain can issue.
- A reservoir from which liquid can be drawn.
- A source or origin of a flow (e.g., of favors or knowledge).
- A roundel barry wavy argent and azure.
- A juggling pattern typically done with an even number of props where each prop is caught by the same hand that throws it.
- A soda fountain.
- A drink poured from a soda fountain, or the cup it is poured into.
- To flow or gush as if from a fountain.