Opponent quite ignoring it regarding historic thing (7)
I believe the answer is:
antique
'regarding historic thing' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'opponent quite ignoring it' is the wordplay.
'opponent' becomes 'anti' (someone opposed to something).
'ignoring' is a deletion indicator.
'quite' with 'it' removed is 'que'.
'anti'+'que'='ANTIQUE'
Can you help me to learn more?
(Other definitions for antique that I've seen before include "Old object of value" , "Lovely old piece" , "From the distant past" , "Old relic" , "Old-fashioned, outdated" .)