Meaning of “extra” - Learner’s Dictionary

extra

noun [ C ] uk us /ˈekstrə/
MORE

B1 something that costs more when you buy goods or pay for a service:

The hi-fi comes with optional extras such as headphones and remote control.
ACTOR

an actor in a film who does not have a main part and usually plays someone in a crowd

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