Vague problem making Chinese dish (3,3)
I believe the answer is:
dim sum
'chinese dish' is the definition.
(I've seen this before)
'vague problem' is the wordplay.
'vague' becomes 'dim' (I've seen this before).
'problem' becomes 'sum' (as in a mathematical problem).
'dim'+'sum'='DIM SUM'
'making' is the link.
(Other definitions for dim sum that I've seen before include "Chinese dumpling dish" , "Asian food" , "oriental dish" , "Chinese dish, includes dumplings" , "steamed dumplings" .)