Cryptic crossword clue
A visit to no13 might be necessary after chewing Danish canapes 5,3,5

The most common and most likely answer to this crossword clue is the 5 plus 3 plus 5 letter word ACHES AND PAINS

A
C
H
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A
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S

Buddy explains!

The straight part
We know that "A visit to no.13 might be necessary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a visit to no.13 might be necessary = aches and pains.
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.

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