Slice of tiramisu knocked back in China (5)
I believe the answer is:
imari
'china' is the definition.
(type of porcelain)
'slice of tiramisu knocked back' is the wordplay.
'slice of' indicates the answer is hidden within the clue.
'knocked back' says the letters should be written backwards.
'irami' can be found hidden inside 'tiramisu'.
'irami' back-to-front is 'IMARI'.
'in' acts as a link.
(Other definitions for imari that I've seen before include "Richly-decorated Japanese porcelain" , "Type of rich Japanese porcelain" , "decorative porcelain" , "decorative ware" , "exotic porcelain" .)