The Collaborative International Dictionary of English v.0.48:

Shopwalker \Shop"walk`er\, n.
   One who walks about in a shop as an overseer and director.
   Cf. Floorwalker.
   [1913 Webster]

WordNet (r) 3.0 (2006):

shopwalker
    n 1: an employee of a retail store who supervises sales
         personnel and helps with customer problems; "a floorwalker
         is called a shopwalker in Britain" [syn: floorwalker,
         shopwalker]