Cryptic crossword clue
Husband straying?  He might catch this! 7

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

I've seen this crossword clue in The Times
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Buddy explains!

The straight part
We know that "Husband straying?  He might catch this!" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case husband straying?  he might catch this! = herring.
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 HERRING mean?

HERRING noun
  1. A type of small, oily fish of the genus Clupea, often used as food.
  2. Fish in the family Clupeidae.
  3. Fish similar to those in genus Clupea, many of those in the order Clupeiformes.

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