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Alma mater is traditional (3,6)

Ross

I believe the answer is:

old school

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'traditional' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for old school that I've seen before include "square" , "Doing things the same way as before" , "Not influenced by newer styles" , "Those who think traditionally" , "Group favouring conservative practices" .)

I've seen this clue in The Daily Express.
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