Light support of container in case carried by Richard (11)
I believe the answer is:
candlestick
'light support' is the definition.
(a candlestick supports or holds up a light)
'container in case carried by richard' is the wordplay.
'container' becomes 'can' (can is a kind of container).
'in case' becomes 'lest' (eg 'lest we forget').
'carried by' is an insertion indicator.
'richard' becomes 'dick' (Dick can be a nickname for Richard).
'lest' placed inside 'dick' is 'dlestick'.
'can'+'dlestick'='CANDLESTICK'
'of' acts as a link.
(Other definitions for candlestick that I've seen before include "light carrier" , "Lights" , "Wax light holder - possible Cluedo murder weapon" , "Device holding a wax light" , "Light bearer" .)