Cryptic crossword clue
Something Blue gets an occasional Epsom run 4

The most common and most likely answer to this crossword clue is the 4 letter word PORN

I've seen this crossword clue in The Guardian
P
O
R
N

Buddy explains!

The straight part
We know that "Something Blue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case something blue = porn.
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 PORN mean?

PORN noun
  1. Pornography.
  2. (chiefly in the plural) A pornographic work.
  3. Material, usually visual, presenting something desirable in a sensational manner.
  4. Material that provides illicit gratification of an obsessive or unhealthy interest in something.

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