The most common and most likely answer to this crossword clue is the 7 letter word OARLOCK
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More clues leading to the result OARLOCK
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The straight part
We know that "Part of boat for rowing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case part of boat for rowing = oarlock.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 OARLOCK mean?
OARLOCK noun- A device attached to the gunwale of a rowboat to hold the oars in place while rowing.