Related Clues:
- It's added or attached to a larger part
- Any annex
- Many a toolbar
- Build an extra room, say
- Thing attached to another
- Attach at the end
- Attach, as a building wing
- Optional feature
- Extra bit
- Chrome extension, e.g
- Home improvement, of a sort
- Attachment formed by a priest with writer at the start of difficult time
- Extra feature
- Software accessory
- Browser extension, e.g