An addition to a Will (7)

I believe the answer is:

codicil

'an addition to a will' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for codicil that I've seen before include "Addition to a will" , "Will's supplement" , "Modifier to will" , "Addendum to will" , "Portion added on to a will" .)

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

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