The most common and most likely answer to this crossword clue is the 10 letter word PARALLELED
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Buddy explains!
The straight part
We know that "Went alongside" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case went alongside = paralleled.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 PARALLELED mean?
PARALLELED verb- To construct or place something parallel to something else.
- Of a path etc: To be parallel to something else.
- Of a process etc: To be analogous to something else.
- To compare or liken something to something else.
- To make to conform to something else in character, motive, aim, etc.
- To equal; to match; to correspond to.
- To produce or adduce as a parallel.