Editorial by directors - that's where the winners are (6,5)

'where the winners are' is the definition.
The definition suggests a singular noun which matches the answer.

'editorial by directors' is the wordplay.
'editorial' becomes 'leader' (both can mean a type of newspaper article).
'by' says to put letters next to each other.
'directors' becomes 'board' (board of directors).
'leader'+'board'='LEADER BOARD'

'that's' is the link.

Can you help me to learn more?