People take an interest in this business (12)
I believe the answer is:
moneylending
'business' is the definition.
The answer and definition are not the same part of speech.
'people take an interest in' is the wordplay.
I cannot quite understand how this works, but
'an' could be 'one' and 'one' is found in the answer.
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'this' is the link.
Can you help me to learn more?
(Another definition for moneylending that I've seen is " Charging of interest on advances".)