The most common and most likely answer to this crossword clue is the 5 letter word ROWER
R
O
W
E
R
More clues leading to the result ROWER
- Perhaps one in eight might, after change of leader
- One in eight, one argues
- Argumentative sportsman?
- One in eight gardeners trimming borders
- Chap in boat having argument with Her Majesty
- Apparently argumentative boatman?
- Cambridge blue perhaps wore pants on river
- Argumentative type, one of eight in crew?
- Boat Race competitor, argumentative sort
- A sportsman, might one argue?
Buddy explains!

The straight part
We know that "Oarsman" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case oarsman = rower.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 ROWER mean?
ROWER noun- One who rows.
- A rowing machine.