Layabout I fish with (6)

I believe the answer is:

plaice

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

'fish with' is the definition.
'plaice' can be an answer for 'fish' (I've seen this before). I am unsure of the 'with' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for plaice that I've seen before include "Location of the fish" , "Swimmer" , "Large flat fish" , "Large flatfish" , "Tasty flatfish I place here" .)

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