What does the cryptic crossword clue "Spare hydrogen in container (4)" mean?

The definition is "Spare". The wordplay uses a charade (building blocks). H (abbreviation of "hydrogen") + TIN (synonym of "container"); definition: "Spare" The answer is Thin.

Spare hydrogen in container (4)

Telegraph Prize Cryptic #3124 | 12 Across | 2021-09-05 flower

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