Clue: British gallery with British artist about to show old curios (4-1-4)
Answer: BRIC-A-BRAC
Explanation: British gallery with British artist about to show old curios (4-1-4)
**Br**(itish) + **I.C.A.** ("gallery") +** B**(ritish) + **R.A.** ("artist") + **c** (circa, so "about") 
*I.C.A. stands for Instirute of Contemporary Art, an art museum and exhibition space in Boston, USA.*
 
*R.A. stands for Royal Academy (of Arts) and is standard crosswrodese for "artist".