What does the cryptic crossword clue "Shore up an exit and circulate (9)" mean?

The definition is "circulate". The wordplay uses charade, reversal. PROP (synonym of "Shore") + A (abbreviation of "an") + GATE (synonym of "exit") [reversal: "up"]; definition: "circulate" The answer is PROPAGATE.

Shore up an exit and circulate (9)

Guardian Cryptic #29238 | 2 Down | 2023-11-27 flower

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