Stages on which Sir Ralph Richardson stood (4)
I believe the answer is:
legs
'stages' is the definition.
('leg' can be a synonym of 'stage')
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for legs that I've seen before include "Members" , "Sections of a journey or course" , "Lower limbs" , "associated with 11 in game" , "Stages of a journey" .)