What does the cryptic crossword clue "Letter from old reservists (5)" mean?

The definition is "Letter". The wordplay uses a charade (building blocks). THE (synonym="THE") + TA (synonym="The Territorial Army") = THETA; definition: "Letter" The answer is THETA.

Letter from old reservists (5)

Guardian Cryptic #29070 | 2 Down | 2023-05-15 flower

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