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Related Clues:
- Not standard
- Computer peripheral, e.g.
- Supplemental component
- Home builder's afterthought
- Expansion
- Garage, perhaps
- Building wing, e.g.
- Extra, and this puzzle's title
- Include as a bonus
- Build an annex
- Enlargement
- Optional item as supplement or increment
- Something attached
- Extra commercial to put on
- Peripheral vision at last following key depth function