Concerning history, it's of consuming interest (6)
I believe the answer is:
repast
'of consuming interest' is the definition.
The definition suggests a singular noun which matches the answer.
'concerning history' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'history' becomes 'past' (I've seen this before).
're'+'past'='REPAST'
'it's' acts as a link.
Can you help me to learn more?
(Other definitions for repast that I've seen before include "Prates about meal" , "Something to eat" , "Banquet" , "lunch?" , "A meal concerning time gone by" .)