Crossword Genius

Write down a suggestion almost entirely in code (8)

Ross

I believe the answer is:

amortise

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'write down' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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

I've seen this clue in The Independent.
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