Crossword Genius

Grandest material for fish catching (8)

Ross

I believe the answer is:

dragnets

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'for fish catching' is the definition.
I can't tell whether this definition defines the answer.

'grandest material' is the wordplay.
'material' indicates anagramming the letters (the letters provide the material for a new word).
'grandest' is an anagram of 'DRAGNETS'.

Can you help me to learn more?

(Other definitions for dragnets that I've seen before include "Scourers of river" , "Meshes drawn across river to catch fish" .)

I've seen this clue in the Sydney Morning Herald.
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