The most common and most likely answer to this crossword clue is the 5 letter word ELVER
I've seen this crossword clue in The Daily Telegraph
E
L
V
E
R
More clues leading to the result ELVER
- Young fish always around loch
- What’s in creel? Very small fish
- Little swimmer is away from the King and Queen
- Swimmer using river always stopped by lake
- Youngster in Anguilla always carrying a meal ticket
- Continually holding line to get fish
- Young fish always circling lake
- Lithe juvenile crossing Channel verified
- Swimmer always found across lake
- Always hanging around Latvia’s capital, slippery little thing
Buddy explains!
The straight part
We know that "Swimmer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case swimmer = elver.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 ELVER mean?
ELVER noun- A young eel.