Crossword Genius

...school that's exploded when virus shielding is withdrawn (3)

Ross

I believe the answer is:

pod

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'school' is the definition.
(I've seen this in other clues)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for pod that I've seen before include "Hull" , "Seed vessel" , "Long seed case" , "A pea grows in it" , "A seedcase; some whales" .)

I've seen this clue in The Irish Times.
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