Eat out: get Chinese (just a serving thereof) (4)
I believe the answer is:
etch
'eat out' is the definition.
(I've seen this before)
'get chinese just a serving thereof' is the wordplay.
'just a serving thereof' indicates the answer is hidden within the clue (a serving or part of the clue).
'ETCH' can be found hidden inside 'get chinese'.
(Other definitions for etch that I've seen before include "Mark" , "Engrave; fix firmly" , "Engrave (glass/metal)" , "Make designs" , "Cut deeply (with acid?)" .)