Related Clues:
- Enlarge the house
- Accompaniment
- Architect's afterthought
- Act of restarting play after football has gone into touch
- Like some fees
- Build a new wing, say
- After-market item
- Home improvement
- Building contractor's job
- Software plug-in
- Optional component
- Supply, as a new ingredient
- Bonus feature
- Peripheral device
- Looking back, gesture from father in extension