See, behaving oddly on the plane trip, a foreigner (8)
I believe the answer is:
nepalese
'a foreigner' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'see behaving oddly on the plane trip' is the wordplay.
'behaving oddly' is an anagram indicator (I've seen this in other clues).
'on' is a charade indicator (letters next to each other).
'trip' indicates an anagram.
'see' is an anagram of 'ese'.
'plane' anagrammed gives 'nepal'.
'ese' put after 'nepal' is 'NEPALESE'.
Can you help me to learn more?
(Other definitions for nepalese that I've seen before include "from Asia" , "foreign" , "High Country people" , "From Kathmandu?" , "High-up person perhaps" .)