It may define class distinction - or lack of it (6,6)

'it' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'it may define class distinction or lack of' is the wordplay.
I cannot really understand how this works, but
'it' could be 't' (abbreviation. e.g. in 'tis) and 't' is located in the answer.
'class' could be 're' (Religious Education, school subject) and 're' is found within the answer.
'or' is found in the answer.
'of' could be 'o' and 'o' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?