Crossword Genius

Stifling summers punctuated by space visitations (5,10)

Ross

I believe the answer is:

close encounters

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

'stifling summers punctuated' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'space visitations' is the wordplay.
I cannot quite understand how this works, but
'space' could be 'en' (in printing, a space as wide as a letter 'n') and 'en' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'by' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.
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