English officer in China first tipped many races there (7,3)
I believe the answer is:
melting pot
'english' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'officer in china first tipped many races there' is the wordplay.
I cannot quite see how this works, but
'officer' could be 'lt' (abbreviation for lieutenant) and 'lt' is found within the answer.
'in' is present in the answer.
'many' could be 'm' (Roman numeral for a thousand) and 'm' is located in the answer.
'first tipped' could be 't' (1st letter of 'tipped') and 't' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for melting pot that I've seen before include "Place where different peoples mix" , "Vessel - place for mixture" , "Place where different peoples mingle" , "Dissolving container" , "In which to mix metals, immigrants" .)