Crossword Genius

200 assembled in lecture by don round university (6,7)

Ross

I believe the answer is:

double century

'200' is the definition.

'assembled in lecture by don round university' is the wordplay.
'assembled in' is an anagram indicator.
'round' indicates putting letters inside.
'university' becomes 'u'.
'lecture'+'by'+'don'='lecturebydon'
'lecturebydon' anagrammed gives 'doublecentry'.
'doublecentry' going around 'u' is 'DOUBLE CENTURY'.

(Another definition for double century that I've seen is " Score of ten score?".)

I've seen this clue in The Independent.
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