What does the cryptic crossword clue "Reliability: function supplied by stronghold (13)" mean?

The wordplay uses a charade (building blocks). STEAD (synonym="function") + FASTNESS (synonym="stronghold") = STEADFASTNESS The answer is STEADFASTNESS.

Reliability: function supplied by stronghold (13)

Guardian Cryptic #29353 | 17 Across | 2024-04-10 flower

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