Second run secures current title for Mo Farah (3)
I believe the answer is:
sir
'title for mo farah' is the definition.
I can't tell whether this defines the answer.
'second run secures current' is the wordplay.
'second' becomes 's' (common abbreviation).
'run' becomes 'r' (cricket abbreviation).
'secures' means one lot of letters goes inside another.
'current' becomes 'I' (symbol for electric current).
's'+'r'='sr'
'sr' going around 'i' is 'SIR'.
Can you help me to learn more?
(Other definitions for sir that I've seen before include "... ___ John Major" , "Polite form of address to a man" , "Knight's prefix" , "Honorary male title" , "Title given to 10 Across" .)