What does the cryptic crossword clue "On choosing to conceal age (9)" mean?

The definition is "On". The wordplay uses a hidden word. ERA (synonym="age") in OPTING (synonym="OPTING") = OPERATING; definition: "On" The answer is OPERATING.

On choosing to conceal age (9)

Guardian Cryptic #25278 | 16 Down | 2011-03-24 flower

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