What does the cryptic crossword clue "Guard small door (6)" mean?

The definition is "Guard". The wordplay uses a charade (building blocks). S (abbreviation="small") + ENTRY (synonym="door") = SENTRY; definition: "Guard" The answer is SENTRY.

Guard small door (6)

Daily Mail Cryptic #16710 | 7 Down | 2021-11-18 flower

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