Only a person working in a Chinese restaurant could provide it (4,6)
I believe the answer is:
bean sprout
'a chinese restaurant could provide it' is the definition.
I can't tell whether this definition defines the answer.
'only a person working in' is the wordplay.
'only' becomes 'but' (but can mean only - eg 'life is but a dream').
'working' is an anagram indicator.
'in' means one lot of letters goes inside another.
'a'+'person'='aperson'
'aperson' anagrammed gives 'eanspro'.
'but' going around 'eanspro' is 'BEAN SPROUT'.
Can you help me to learn more?
(Other definitions for bean sprout that I've seen before include "vegetable" , "One may be prepared for Chinese" .)