What does the cryptic crossword clue "Rusty old, old nails very, very strong, marines concluding (3,4)" mean?

The wordplay uses a charade (building blocks). O (synonym="old") + FFF (synonym="very very strong") + O (synonym="old") + RM (synonym="RM") = OFFFORM The answer is OFFFORM.

Rusty old, old nails very, very strong, marines concluding (3,4)

Guardian Cryptic #29182 | 22 Across | 2023-09-22 flower

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