Advantageous arrangement of seats (5)
I believe the answer is:
asset
'advantageous arrangement' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?
'of seats' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'seats' anagrammed gives 'ASSET'.
Can you help me to learn more?
(Other definitions for asset that I've seen before include "It's an advantage to declare" , "Item well worth having" , "Holding" , "Seats (anag.)" , "A thing of value" .)