What does the cryptic crossword clue "Infestation picked up beneath circular building (7)" mean?

The definition is "building". The wordplay uses a homophone (sounds like). ROT (infestation) + UNDA – sounds like (picked up) ‘under’ (beneath) The answer is ROTUNDA.

Infestation picked up beneath circular building (7)

Guardian Cryptic #29361 | 23 Across | 2024-04-19 flower

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