Something made up about cafe trading sandwiches (8)
I believe the answer is:
artefact
'something made' is the definition.
I can't judge whether this defines the answer.
'up about cafe trading sandwiches' is the wordplay.
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'sandwiches' indicates a hidden word (the answer is sandwiched in by the clue).
'tcafetra' is hidden in the letters of 'about cafe trading'.
'tcafetra' reversed gives 'ARTEFACT'.
Can you help me to learn more?
(Other definitions for artefact that I've seen before include "A result of craft" , "hand-made thing" , "Human-made article" , "Man-made item" , "Man-made object, of archaeological interest, perhaps" .)