People who could show Bess round the air terminal (5)
I believe the answer is:
serbs
'people' is the definition.
Both the definition and answer are plural nouns.
Maybe you can see an association between them that I can't see?
'show bess round the air terminal' is the wordplay.
I cannot really see how this works, but
'show' could be 'er' (US medical drama) and 'er' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'who could' acts as a link.
Can you help me to learn more?
(Another definition for serbs that I've seen is " People from Belgrade, say".)