What the foreigner wanting airmail stationery asked for? (8)
I believe the answer is:
flypaper
'for?' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for flypaper that I've seen before include "for hanging being used for killing" , "Sticky strip that catches small insects" , "Sticky trap for bluebottles etc" , "Bluebottle catcher" , "one collecting insects" .)