Renowned solicitor to open proceedings (5,3)
I believe the answer is:
start out
'open proceedings' is the definition.
'start out' can be an answer for 'open' (I've seen this in another clue). I'm not sure about the 'proceedings' bit.
'renowned solicitor' is the wordplay.
'renowned' becomes 'star' (I am not sure about this - if you are sure you should believe this answer much more).
'solicitor' becomes 'tout' (someone who solicits business).
'star'+'tout'='START OUT'
'to' is the link.
Can you help me to learn more?
(Other definitions for start out that I've seen before include "Begin a journey" , "Go off" , "hit the road" , "Embark (on a venture)" , "Set off" .)