Meaning of “lead” - Learner’s Dictionary

lead

noun uk us /liːd/
WINNING [ no plural ]

B2 a winning position during a race or other situation where people are competing:

She's in the lead (= winning).
France has just taken the lead (= started to win).
a three-goal lead
FILM/PLAY [ C ]

the main person in a film or play:

She plays the lead in both movies.
DOG [ C ] UK (US leash)

a chain or piece of leather fixed to a dog's collar so that it can be controlled:

Dogs must be kept on a lead at all times.
ELECTRICITY [ C ] UK (US cord)
INFORMATION [ C ]

information about a crime that police are trying to solve:

Police are chasing up a new lead.

(Definition of “lead noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)