What does the cryptic crossword clue "Old second line heading for Omani capital (4)" mean?

The definition is "capital". The wordplay uses a charade (building blocks). O (abbreviation="Old") + S (abbreviation="second") + L (abbreviation="line") + O (first_letter="Omani") = OSLO; definition: "capital" The answer is OSLO.

Old second line heading for Omani capital (4)

Telegraph Prize Cryptic #3183 | 13 Across | 2022-10-23 flower

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