Ex-President is concerning once more, I conceded (6)
I believe the answer is:
reagan
'ex-president' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'concerning once more i conceded' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'once more' becomes 'again' (synonyms).
'conceded' indicates named letters should be taken away (concede can mean to give up).
'again' with 'i' taken out is 'agan'.
're'+'agan'='REAGAN'
'is' is the link.
Can you help me to learn more?
(Other definitions for reagan that I've seen before include "40th US president, d. 2004" , "Ronald ...... ex-American president" , "Former US president" , "Ronald . . . . . ., 40th president of USA" , "head of state" .)