What angler uses bringing a lot of marine fish up (3)
I believe the answer is:
rod
'what angler uses' is the definition.
I can't judge whether this definition defines the answer.
'a lot of marine fish up' is the wordplay.
'a lot of' means to remove the last letter (a lot of the word but not all of it).
'marine fish' becomes 'dory' (I've seen this before).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'dory' with its final letter taken off is 'dor'.
'dor' reversed gives 'ROD'.
'bringing' is the link.
Can you help me to learn more?
(Other definitions for rod that I've seen before include "An angler's stick" , "Thin straight bar" , "Long, straight stick" , "The fly fisherman's stick" , "something fisherman brings home" .)