One nurse forced to pay protection money? (6)

I believe the answer is:

insure

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'to pay protection money?' is the definition.
I can't judge whether this defines the answer.

'one nurse forced' is the wordplay.
'one' becomes 'i' (Roman numeral).
'forced' indicates an anagram.
'nurse' with letters rearranged gives 'nsure'.
'i'+'nsure'='INSURE'

Can you help me to learn more?

(Other definitions for insure that I've seen before include "Make certain" , "Protect by taking out a policy" , "do business at Lloyds?" , "Guarantee against loss" , "Take out a policy" .)

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