Characteristics of article being rejected - true to form! (6)
I believe the answer is:
nature
'characteristics' is the definition.
(I have seen 'Inborn characteristics ' mean 'nature' so perhaps 'characteristics' could also mean 'nature')
'article being rejected true to form' is the wordplay.
'article' becomes 'an' (indefinite article).
'being rejected' says the letters should be written in reverse.
'to form' indicates anagramming the letters.
'an' in reverse letter order is 'na'.
'true' is an anagram of 'ture'.
'na'+'ture'='NATURE'
'of' is the link.
(Other definitions for nature that I've seen before include "Kind - disposition" , "Innate quality" , "The external, untouched world" , "Essence; kind" , "It abhors a vacuum, according to Aristotle" .)