What does the cryptic crossword clue "Old money? Discuss at length (7)" mean?

The definition is "Old money?". The wordplay uses a charade (building blocks). EX (synonym of "Old") + POUND (synonym of "money?"); definition: "Discuss at length" The answer is Expound.

Old money? Discuss at length (7)

Telegraph Prize Cryptic #3052 | 18 Down | 2020-04-19 flower

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