For one, a pity to confuse new and ancient language (8)
I believe the answer is:
egyptian
'ancient language' is the definition.
(I've seen this before)
'for one a pity to confuse new' is the wordplay.
'for one' becomes 'eg' (both can mean 'for example').
'to confuse' is an anagram indicator.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'a'+'pity'='apity'
'apity' is an anagram of 'yptia'.
'eg'+'yptia'+'n'='EGYPTIAN'
'and' is the link.
(Other definitions for egyptian that I've seen before include "Nationality of a Pharaoh" , "From North African country" , "Mummy" , "Eg, native of Cairo" , "tongue, once" .)