Cryptic crossword clue
Seamen hit rocks, struggling with this? 9

The most common and most likely answer to this crossword clue is the 9 letter word MAINSHEET

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

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

MAINSHEET noun
  1. The rope connected to and controlling the mainsail.

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