Affluent association at the West End (3)
I believe the answer is:
fat
'affluent' is the definition.
(thesaurus)
'association at the west end' is the wordplay.
'association at' becomes 'fa' (I can't justify this - if you can you should give a lot more credence to this answer).
'end' says to take the final letters.
The final letter of 'west' is 't'.
'fa'+'t'='FAT'
Can you help me to learn more?
(Other definitions for fat that I've seen before include "Cooking grease" , "Obese, having spare tyre etc" , "Adipose tissue" , "Substantial" , "Excess body weight" .)