While having the right to enter, though from outer space (6)

I believe the answer is:

aliens

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'enter though from outer space' is the definition.
I can't judge whether this definition defines the answer.

'while having the right' is the wordplay.
'while' becomes 'as' (eg 'while I walked' means 'as I walked').
'having' is an insertion indicator.
'the right' becomes 'lien' (legal right).
'as' going around 'lien' is 'ALIENS'.

'to' is the link.

Can you help me to learn more?

(Other definitions for aliens that I've seen before include "Non-nationals - perhaps from Mars?" , "Outsiders" , "'Little green men'?" , "Extra-terrestrial beings" , "Foreigners or creatures from outer space" .)

I've seen this clue in the Evening Standard.

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