Retired potter Charlie finished pot for Murray etc. (5,3)
I believe the answer is:
davis cup
'pot for murray etc' is the definition.
I can't tell whether this defines the answer.
'retired potter charlie finished' is the wordplay.
'retired potter' becomes 'davis' (I am not sure about this - if you are sure you should believe this answer much more).
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'finished' becomes 'up' (similar in meaning).
'davis'+'c'+'up'='DAVIS CUP'
Can you help me to learn more?
(Other definitions for davis cup that I've seen before include "International tennis tournament" , "International lawn tennis championship" , "Annual tennis team championship award" , "International tennis team championship" , "Sets competition" .)