Beseech space visitor to produce (5)

I believe the answer is:

beget

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'to produce' is the definition.
(I've seen this in another clue)

'beseech space visitor' is the wordplay.
'beseech' becomes 'beg' (I've seen this before).
'space visitor' becomes 'et' (I can't explain this - if you can you should give a lot more credence to this answer).
'beg'+'et'='BEGET'

Can you help me to learn more?

(Other definitions for beget that I've seen before include "Father" , "Produce (child) (archaic)" , "Sire" , "Bring about, cause" , "Give rise to; create (children)" .)

I've seen this clue in the Sydney Morning Herald.

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