Crossword Genius

Party after University exam in ancient wheeled shelter? (7)

Ross

I believe the answer is:

testudo

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

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

'party after university exam in ancient wheeled' is the wordplay.
I cannot really understand how this works, but
'party' could be 'do' (do can informally mean a party) and 'do' is located in the answer.
'university' could be 'u' (abbreviation for university) and 'u' is found within the answer.
'exam' could be 'test' (synonyms) and 'test' is found in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for testudo that I've seen before include "Roman defence with shields" , "Old army shelter" , "cover for safety" , "military shelter" , "Roman siege screen" .)

I've seen this clue in The Irish Times.
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