What does the cryptic crossword clue "Part of an atom of gas probed by London university (7)" mean?

The definition is "Part of an atom". The wordplay uses a container (one word inside another). UCL (synonym="University College London") in NEON (synonym="NEON") = NUCLEON; definition: "Part of an atom" The answer is NUCLEON.

Part of an atom of gas probed by London university (7)

Times Cryptic #28869 | 19 Down | 2024-03-20 flower

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