Cryptic crossword clue
Direction of U-boat maybe a secondary issue 10

The most common and most likely answer to this crossword clue is the 10 letter word SUBHEADING

I've seen this crossword clue in Independent
S
U
B
H
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A
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I
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Buddy explains!

The straight part
We know that "a secondary issue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a secondary issue = subheading.
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 SUBHEADING mean?

SUBHEADING noun
  1. Any of the headings under which each of the main divisions of a subject may be subdivided
  2. A heading or caption subordinate to a main headline, heading, or title especially when inserted as a divider between sections (as of a newspaper or periodical article or story or text of a book)

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