One of a Car’s Main Illuminators
Puzzle 1 of Tough Things Pack
Question is: One of a Car’s Main Illuminators
and the answer is: HEADLIGHT
Word Meaning:
HEADLIGHT — A bright light, with a lens and reflector, on the front of a motor vehicle (or originally a ship or train), designed to illuminate the road when driving at night; normally one of a pair.
Definitions from Wiktionary.