Clue: Tyneside-born artist maintaining pose in US state (8)
Answer: NEBRASKA
Explanation: Definition: US state

**N.E.** (North East, so "Tyneside") + **B** (born) + **RA** (member of the Royal Academy, so "artist") *maintaining* **ASK** ("pose")
 

 
*Of course, Tyneside is only NE if you're English; to me it's South 🙂