Staff accepting Japanese currency? Hot stuff (7)
I believe the answer is:
cayenne
'hot stuff' is the definition.
(I've seen this in another clue)
'staff accepting japanese currency?' is the wordplay.
'staff' becomes 'cane' (I've seen this in another clue).
'accepting' means one lot of letters goes inside another (inserted letters are accepted).
'japanese currency?' becomes 'yen' (the currency of Japan is the yen).
'cane' enclosing 'yen' is 'CAYENNE'.
(Other definitions for cayenne that I've seen before include "Hot red powder" , "in kitchen found extremely hot stuff" , "Hot red spice" , "Kind of pepper" , "Former French penal colony - pepper" .)