Crossword Genius

Plodding students struggle endlessly? Hard cheese! (7)

Ross

I believe the answer is:

sapsago

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'cheese' is the definition.
(thesaurus)

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for sapsago that I've seen is " Green cheese".)

I've seen this clue in The Times and The Sunday Times.
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