What does the cryptic crossword clue "Thin wrapping material can be frustrating? (7)" mean?

The definition is "Thin wrapping material". The wordplay uses a charade (building blocks). TIN (synonym="can") + FOIL (synonym="be frustrating") = TINFOIL; definition: "Thin wrapping material" The answer is TINFOIL.

Thin wrapping material can be frustrating? (7)

Times Cryptic #28269 | 5 Down | 2022-04-20 flower

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