Confines one male with money (8)
I believe the answer is:
impounds
'confines' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot understand how they can define each other.
'one male with money' is the wordplay.
'one' becomes 'i' (Roman numeral).
'male' becomes 'm' (common abbreviation).
'with money' becomes 'pounds' (I can't explain this - if you can you should give a lot more credence to this answer).
'i'+'m'+'pounds'='IMPOUNDS'
Can you help me to learn more?
(Another definition for impounds that I've seen is " Takes into legal custody, like stray horse".)