Crossword Genius

When graduates trained hoi polloi (5,8)

Ross

I believe the answer is:

great unwashed

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'when graduates trained hoi polloi' is the definition.
I can't tell whether this definition defines the answer.

'when graduates trained' is the wordplay.
'trained' indicates anagramming the letters (to train can mean to grow something into a shape).
'when'+'graduates'='whengraduates'
'whengraduates' is an anagram of 'GREAT UNWASHED'.

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I've seen this clue in The Everyman puzzle in The Observer.
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