Extra feature

ADDON

Think of something you might include with software or a purchase to enhance its functionality, often optional. It starts with "add" but isn’t the action itself.

"Extra feature" is a straightforward clue pointing to something added beyond the original. The answer "ADDON" fits perfectly because it literally means an optional or supplementary component, like an extra software module or accessory. There’s no hidden wordplay here—just a direct definition where "add" hints at inclusion and "on" reinforces the idea of attaching something extra. It’s a common tech and retail term, making it a natural match.