Cryptic crossword clue
Swimmers used to swim in West? 7

The most common and most likely answer to this crossword clue is the 7 letter word MEDUSAE

I've seen this crossword clue in The Times
M
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The straight part
We know that "Swimmers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case swimmers = medusae.
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 MEDUSAE mean?

MEDUSAE noun
  1. A jellyfish; specifically , a non-polyp form of individual cnidarians, consisting of a gelatinous umbrella-shaped bell and trailing tentacles.

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