Crossword Genius

Thin wrapping can frustrate (7)

Ross

I believe the answer is:

tinfoil

'thin wrapping' is the definition.
(tinfoil is a thin material)

'can frustrate' is the wordplay.
'can' becomes 'tin' (both are metal containers).
'frustrate' becomes 'foil' (synonyms).
'tin'+'foil'='TINFOIL'

(Other definitions for tinfoil that I've seen before include "Food wrapper" , "Kitchen item" , "Thin metallic sheet" , "Fine metal" , "up to wrapping up dope" .)

I've seen this clue in The Guardian.
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