A money changer who had a farm (6)
I believe the answer is:
yeoman
'a money changer who had a farm' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'a money changer who had a farm' is the wordplay.
'a money' can be anagrammed to 'YEOMAN'.
Though, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for yeoman that I've seen before include "One guarding" , "Royal guard" , ". . . . . . of the Guard (operetta) (6)" , "Farming freeholder of old" , "... of the Guard (Gilbert and Sullivan)" .)