1) An antique dealer, sometimes 2) Antique shop employee 3) Antique shop worker 4) Art museum specialist 5) Gallery specialist 6) Mender of paintings 7) Museum employe 8) Museum employee 9) Museum specialist 10) Museum worker 11) One working on antiques 12) Painting fixer 13) Preserver 14) Refinisher Found on https://www.crosswordclues.com/clue/restorer
See also CONSERVATOR (165) A person who repairs objects, attempting to return them as closely as possible to their original condition
Found on http://www.ifla.org/VII/s30/pub/mg1.htm#5