This man invaded England (3)

I believe the answer is:

nor

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'england' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'this man invaded' is the wordplay.
'this man' becomes 'N' (knight, a man in chess).
'invaded' becomes 'or' (I can't explain this - if you can you should believe this answer much more).
'n'+'or'='NOR'

Can you help me to learn more?

(Other definitions for nor that I've seen before include "Word paired with "neither"" , "In addition, not" , "Conjunction meaning 'and not'" , "Link word" , "Common conjunction, goes with neither" .)

I've seen this clue in The Globe and Mail.

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