What does the cryptic crossword clue "Guess a second letter (4)" mean?

The definition is "letter". The wordplay uses a charade (building blocks). BET (synonym="guess") + A (synonym="A") = BETA; definition: "second letter" The answer is BETA.

Guess a second letter (4)

Guardian Cryptic #29588 | 1 Down | 2025-01-10 flower

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