Caterer arranged to entertain posh soul (8)
I believe the answer is:
creature
'soul' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'caterer arranged to entertain posh' is the wordplay.
'arranged' indicates an anagram.
'to entertain' means one lot of letters goes inside another.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-U).
'caterer' is an anagram of 'creatre'.
'creatre' going around 'u' is 'CREATURE'.
Can you help me to learn more?
(Other definitions for creature that I've seen before include "Human being or lower animal" , "Bird, beast, insect etc" , "Any organism with voluntary movement" , "Brute" , "These comforts make life easy" .)