Strange lot, if in thin wrapping (7)
I believe the answer is:
tinfoil
'thin wrapping' is the definition.
'strange lot if in' is the wordplay.
'strange' indicates an anagram.
'lot'+'if'+'in'='lotifin'
'lotifin' with letters rearranged gives 'TINFOIL'.
(Other definitions for tinfoil that I've seen before include "Kitchen item" , "Wrapping around food" , "Food wrapper" , "Thin metallic sheets for protecting food" , "Thin metal sheet for wrapping food etc" .)