Crossword Genius

Game's left-winger to make complaint (3,6)

Ross

I believe the answer is:

red grouse

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

'left-winger to make complaint' is the wordplay.
'left-winger' becomes 'red' (red is a kind of left-winger).
'to make complaint' becomes 'grouse'.
'red'+'grouse'='RED GROUSE'

(Other definitions for red grouse that I've seen before include "Game bird" , "Moorland bird" .)

I've seen this clue in The Guardian.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.