Related Clues:
- Garage, perhaps
- Building wing, e.g.
- Extra, and this puzzle's title
- Include as a bonus
- Build an annex
- Enlargement
- In name only or token payment
- In name only or of token value (7)
- In name only or of face value
- In name only, like face value of coin
- In name or form only
- Optional item as supplement or increment
- Something attached
- What's in a name? Here there's nothing grand in a pound
- How you won't get any thousand in a fifty