Foreigner the child and I had seen running (7)
I believe the answer is:
chinese
'foreigner' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'child and i had seen running' is the wordplay.
'child' becomes 'ch' (abbreviation for child).
'and' means one lot of letters go next to another.
'had' means one lot of letters go next to another.
'running' indicates anagramming the letters (the letters run around to different places).
'seen' with letters rearranged gives 'nese'.
'ch'+'i'+'nese'='CHINESE'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for chinese that I've seen before include "Since he is from a very populated nation" , "from the east" , "See 13" , "From Shanghai, say?" , "Board game, -- checkers" .)