Related Clues:
- Computer peripheral, say
- Extend with
- Extra purchase
- Reflects gesture from New York barman in supplement
- After-market item (2 words)
- Building contractor's job (2 words)
- Accessory found in widespread donation
- Any annex
- Many a toolbar
- Build an extra room, say
- Attach at the end
- Attach, as a building wing
- Optional feature
- Extra bit
- Chrome extension, e.g