Crossword Genius

Soldier cut open by my men in China (5,8)

Ross

I believe the answer is:

lance corporal

I'm a little stuck... Click here to teach me more about this clue!

'my men in china' is the definition.
I can't judge whether this defines the answer.

'soldier cut open by' is the wordplay.
'soldier' becomes 'corporal' ().
'cut open' becomes 'lance' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'corporal' put after 'lance' is 'LANCE-CORPORAL'.

Can you help me to learn more?

(Other definitions for lance corporal that I've seen before include "Army rank" , "Junior NCO in the British Army" , "NCO rank" , "Soldier" .)

I've seen this clue in The Sunday Times and The Times.
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