Clue: It's a newly-built bordering road ? it's more spacious than it looks (6)
Answer: TARDIS
Explanation: Definition: it's more spacious than it looks
***(its a)** [anag:*newly-built*] *bordering* **Rd.** (road) 
*For those who may not be familiar with Dr Who, the TARDIS is Dr Who's time-travelling "ship", which from the outside has the dimensions of a police box, but is considerably larger on the inside.