Free article being rejected is a low point (5)
I believe the answer is:
nadir
'low point' is the definition.
(I've seen this before)
'free article being rejected' is the wordplay.
'free' becomes 'rid' ('rid' can be a synonym of 'free'**).
'article' becomes 'an' (indefinite article).
'being rejected' says the letters should be written in reverse.
'rid'+'an'='ridan'
'ridan' in reverse letter order is 'NADIR'.
'is a' is the link.
(Other definitions for nadir that I've seen before include "Drain to lowest level" , "The lowest point of anything" , "You can't sink lower!" , "Point of greatest despair" , "Drain into the lowest point (5)" .)