Fish with appendages for walking on (7)

I believe the answer is:

legside

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

'walking on' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'fish with appendages' is the wordplay.
'fish' becomes 'ide' (type of fish).
'with' says to put letters next to each other.
'appendages' becomes 'legs' (leg is a kind of appendage).
'ide' after 'legs' is 'LEGSIDE'.

'for' is the link.

Can you help me to learn more?

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.