Strange Martian? He's not one (8)

I believe the answer is:

earthman

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'strange martian? he's not one' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'strange martian? he's not one' is the wordplay.
'strange' is an anagram indicator.
'not' indicates named letters should be taken away.
'one' becomes 'i' (Roman numeral).
'martian'+'he'='martianhe'
'martianhe' with 'i' taken away is 'martanhe'.
'martanhe' with letters rearranged gives 'EARTHMAN'.

Can you help me to learn more?

(Another definition for earthman that I've seen is " Human (sci-fi)".)

I've seen this clue in The Independent.

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