What does the cryptic crossword clue "Elementary particle London college discovered in gas (7)" mean?

The definition is "Elementary particle". The wordplay uses a container (one word inside another). UCL (synonym="London college – University College London") in NEON (synonym="gas") = NUCLEON; definition: "Elementary particle" The answer is NUCLEON.

Elementary particle London college discovered in gas (7)

Times Cryptic #29198 | 11 Across | 2025-04-08 flower

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