Crossword Genius

Sportsman showing displeasure when lake is filled in (6)

Ross

I believe the answer is:

angler

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'sportsman' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

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(Other definitions for angler that I've seen before include "who looks for compliments" , "He fishes with rod and line" , "person hoping to catch fish" , "I may do casting" , "Fisher with rod and line" .)

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