Grandest material for fish catching (8)
I believe the answer is:
dragnets
'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" .)