The most common and most likely answer to this crossword clue is the 6 letter word CHARON
C
H
A
R
O
N
More clues leading to the result CHARON
- I rowed with those who passed tea about
- Swimmer working for legendary boatman
- Greek ferry operator taking late arrivals
- Greek ferry operator casts anchor
- Cleaner operating as underground transporter
- Ferryman takes companion forward, crossing a river
- River-crosser wants tea before getting on
- Burn adorning Hades boatman
- Legendary figure with a boat and anchor needing repair
Buddy explains!

The straight part
We know that "I rowed with those who passed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case i rowed with those who passed = charon.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.