What does the cryptic crossword clue "Circle huge letter (5)" mean?

The definition is "letter". The wordplay uses a charade (building blocks). O (abbreviation="Circle") + MEGA (synonym="huge") = OMEGA; definition: "letter" The answer is OMEGA.

Circle huge letter (5)

Daily Mail Cryptic #16399 | 2 Down | 2020-09-09 flower

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