small part; bit part; extra
Refers to a minor role in a film, TV show, or play. Often used in entertainment contexts.
He played a bit part in that movie.
Even for a small role, it's worth auditioning.
Combination of ちょい (a colloquial prefix meaning 'a little' or 'slight') and 役 (role). The exact origin of ちょい is uncertain, but it is commonly used in casual speech.