Man's man is moon explorer? (8)

I believe the answer is:

islander

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

'man's man' is the definition.
(I've seen this in another clue)

'is moon explorer?' is the wordplay.
'moon explorer?' becomes 'lander' (I can't justify this - if you can you should believe this answer much more).
'is'+'lander'='ISLANDER'

Can you help me to learn more?

(Other definitions for islander that I've seen before include "Eg, a Manxman" , "person from Cuba?" , "Native of Bali, perhaps" , "Manxman, maybe," , "Friendly person" .)

I've seen this clue in The Sun.

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