The most common and most likely answer to this crossword clue is the 10 letter word END-TO-END
E
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D
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More clues leading to the result END-TO-END
Buddy explains!

The straight part
We know that "throughout" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case throughout = end-to-end.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 END-TO-END mean?
END-TO-END adjective- (of a collection of items) Arranged such that each end of a given item is adjacent to one end of a different item.
- From one end to the other.
- Smoothly alternating between attacking and defensive plays.