Act weakly to have debts seized by creditor (5)
I believe the answer is:
Here is my best explanation:
'act weakly' is the definition.
'to have debts seized by creditor' is the wordplay.
'to have debts' becomes 'owe'.
'seized by' means one lot of letters goes inside another.
'creditor' becomes 'cr'.
'owe' placed into 'cr' is 'COWER'.