Medium oval with 50 in running contest (6)
I believe the answer is:
oracle
'medium' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'oval with 50 in running contest' is the wordplay.
'oval' becomes 'O'.
'with' means one lot of letters go next to another.
'50' becomes 'l' (Roman numeral).
'in' means one lot of letters goes inside another.
'running contest' becomes 'race' (I've seen this before).
'l' inserted into 'race' is 'racle'.
'o'+'racle'='ORACLE'
Can you help me to learn more?
(Other definitions for oracle that I've seen before include "Holy place in ancient times where gods prophesied" , "Ancient Greek expounder of wisdom" , "A famous one at Delphi" , "Source of information" , "Seer" .)