Tom raise doctor to liquidate a mortgage? (8)

I believe the answer is:

amortise

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'liquidate a mortgage?' is the definition.
'amortise' can be an answer for 'liquidate' (amortising is a kind of liquidating). I'm unsure of the 'a mortgage?' bit.

'tom raise doctor' is the wordplay.
'doctor' indicates anagramming the letters.
'tom'+'raise'='tomraise'
'tomraise' anagrammed gives 'AMORTISE'.

'to' is the link.

Can you help me to learn more?

(Other definitions for amortise that I've seen before include "Liquidate gradually" , "Gradually write off initial costs" .)

I've seen this clue in the Sydney Morning Herald.

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