Thinking America will stop China (6)
I believe the answer is:
musing
'thinking' is the definition.
(musing is a kind of thinking)
'america will stop china' is the wordplay.
I cannot quite see how this works, but
'america' could be 'us' (abbreviation for the United States) and 'us' is found in the answer.
'china' could be 'ming' (I've seen this before) and 'ming' is found in the leftover letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for musing that I've seen before include "Reflecting or pondering" , "Absorbed in thought" , "Cogitation" , "Reflecting in silence" , "reflection" .)