Factories circling island anger small flush person (13)
I believe the answer is:
millionairess
'flush person' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'factories circling island anger small' is the wordplay.
'factories' becomes 'mills' ('mill' can be a synonym of 'factory').
'circling' means one lot of letters goes inside another (circling can mean going around or containing).
'island' becomes 'iona' (Scottish island).
'anger small' becomes 'ires' (I can't explain this - if you can you should believe this answer much more).
'iona'+'ires'='ionaires'
'mills' going around 'ionaires' is 'MILLIONAIRESS'.
Can you help me to learn more?
(Another definition for millionairess that I've seen is " Rich woman".)