Answer: griper

AnswerCrossword Clue
GRIPERBeef producer?
GRIPERMalcontent
GRIPERComplaining sort
GRIPERGrouser: Slang.
GRIPERG. I. grumbler.
GRIPERComplainer
GRIPERBellyaching sort
griperone that gripes (to keep on complaining)
griperto complain
gripercomplaint
griperto annoy
griperto produce pain in the bowels of