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Make a list of awful, semiliterate letters, later abandoned (7)

Ross

I believe the answer is:

itemise

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'make a list' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for itemise that I've seen before include "List one by one (S, not Z)" , "Formulate a list" , "List out singly" , "Using spell out" , "List in detail" .)

I've seen this clue in The Irish Times.
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