The most common and most likely answer to this crossword clue is the 8 letter word PADDLING
P
A
D
D
L
I
N
G
More clues leading to the result PADDLING
Buddy explains!

The straight part
We know that "In row, perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in row, perhaps = paddling.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 PADDLING mean?
PADDLING verb- To propel something through water with a paddle, oar, hands, etc.
- To row a boat with less than one's full capacity.
- To spank with a paddle.
- To pat or stroke amorously or gently.
- To tread upon; to trample.
- To walk or dabble playfully in shallow water, especially at the seaside.
- To toddle.
- To toy or caress using hands or fingers.
- The act of using a paddle.
- An act of corporal punishment consisting of spanking the buttocks with a paddle.
- A collective noun for ducks when they are on water.