Old nickname for a policeman (taken from the Home Secretary who set up the Metropolitan Police in 1829) (6)

I believe the answer is:

peeler

(Other definitions for peeler that I've seen before include "Potato skinner" , "Old policeman (useful for potatoes!)" , "Very old English cop, or spud scraper" , "kitchen utensil" , "Kitchen knife" .)

I've seen this clue in The Guardian.

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