Neil Armstrong somewhat upset being in outer space? (5)
I believe the answer is:
alien
'space?' is the definition.
(thesaurus)
'neil armstrong somewhat upset being in outer' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'neil' is 'lien' which is present in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for alien that I've seen before include "Foreign; extraterrestrial" , "Outlandish" , "Stranger" , "ET" , "coming from overseas" .)