Page, upstanding retro hotel employee (6)
I believe the answer is:
porter
'hotel employee' is the definition.
(hotels employ porters)
'page upstanding retro' is the wordplay.
'page' becomes 'p'.
'upstanding' says the letters should be written backwards.
'retro' reversed gives 'orter'.
'p'+'orter'='PORTER'
(Other definitions for porter that I've seen before include "Cole - - , songwriter" , "Doorkeeper; dark beer" , "Bearer" , "Hotel bag-carrier or dark beer" , "One fetches and carries the drink" .)