Crossword Genius

Pupils contest theory of marks, reportedly (5,8)

Ross

I believe the answer is:

class struggle

I'm a little stuck... Click here to teach me more about this clue!

'theory of marks reportedly' is the definition.
I can't judge whether this defines the answer.

'pupils contest' is the wordplay.
'pupils' becomes 'class' (I've seen this before).
'contest' becomes 'struggle' (I've seen this in another clue).
'class'+'struggle'='CLASS STRUGGLE'

Can you help me to learn more?

(Another definition for class struggle that I've seen is " Conflict between workers and the ruling class".)

I've seen this clue in The Telegraph.
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