Additional comment recalled at this point in class (6)
I believe the answer is:
sphere
'class' is the definition.
(thesaurus)
'additional comment recalled at this point' is the wordplay.
'additional comment' becomes 'ps' (PS is an example. I am not sure about the 'additional' bit.).
'recalled' says the letters should be written backwards (to recall can mean to bring something back).
'at this point' becomes 'here' (here means in this place).
'ps' written backwards gives 'sp'.
'sp'+'here'='SPHERE'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sphere that I've seen before include "Province - range" , "Ball, orb" , "Particular environment or walk of life" , "Shape of the Earth" , "Ball or field of influence" .)