Having rows is all they're good for (4)

I believe the answer is:

oars

I'm a little stuck... Click here to teach me more about this clue!

'having rows' is the definition.
I know that 'rows' relates to this answer.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for oars that I've seen before include "Sculls" , "Indirectly, they make waves" , "Sweeps" , "Busy bodies usually stick them in, also used in rowing" , "Al --, US gangster" .)

I've seen this clue in The Irish Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.