Chinese native and Yankee consuming gateau - it's Shrove Tuesday! (7,3)
I believe the answer is:
pancake day
'shrove tuesday' is the definition.
(synonyms)
'chinese native and yankee consuming gateau' is the wordplay.
'chinese native' becomes 'panda' (I've seen this before).
'and' means one lot of letters go next to another.
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'consuming' is an insertion indicator.
'gateau' becomes 'cake' (I've seen this before).
'panda'+'y'='panday'
'panday' enclosing 'cake' is 'PANCAKE DAY'.
'it's' is the link.
(Other definitions for pancake day that I've seen before include "Shrove Tuesday" , "Shrove Tues. (colloq.)" .)