Overshadowed (8)
(Other definitions for upstaged that I've seen before include "Drew attention to oneself away from someone else" , "Outmanoeuvred by player" , "Diverted attention from - another actor?" , "Outshone" , "Drew attention from (another actor)" .)
'overshadowed' is the definition.
(eclipsing is a kind of overshadowing)
This is the entire clue.
(Other definitions for eclipsed that I've seen before include "Surpassed - led epics (anag)" , "Obscured as by heavenly body" , "Hidden" , "Overshadowed" , "Made obscure" .)