Get Margo prepared for an expensive commitment? (8)

I believe the answer is:

mortgage

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'an expensive commitment?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'get margo prepared' is the wordplay.
'prepared' indicates an anagram.
'get'+'margo'='getmargo'
'getmargo' with letters rearranged gives 'MORTGAGE'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for mortgage that I've seen before include "Borrowing agreement" , "Loan secured against property" , "Home loan" , "Amount owed on a property" , "Loan raised to buy a house" .)

I've seen this clue in The Times.

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