What does the cryptic crossword clue "Book probing source subject of much SF (5)" mean?

The definition is "subject of much SF". The wordplay uses charade, container. B (synonym of "Book") + ROOT (synonym of "source") [container: "probing"]; definition: "subject of much SF" The answer is ROBOT.

Book probing source subject of much SF (5)

Times Cryptic #29153 | 2 Down | 2025-02-14 flower

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