Met up for coffee (5)
I believe the answer is:
decaf
'for coffee' is the definition.
(type of coffee)
'met up' is the wordplay.
'met' becomes 'faced' (facing is a kind of meeting).
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'faced' in reverse letter order is 'DECAF'.
(Other definitions for decaf that I've seen before include "Type of coffee" , "Non-alcoholic drink" , "Coffee without the kick?" , "Cup substitute missing kick" , "Style of coffee" .)