Regulator or Overseer; Canine That Guards/protects
This page is the CodyCross answer for the clue below from London, Group 492, Puzzle 4 (Cheap as Chips).
Question is: Regulator or Overseer; Canine That Guards/protects
and the answer is: WATCHDOG
Word Meaning:
WATCHDOG — A guard dog.
Definitions from Wiktionary.