Crossword Genius

Delete some of the matter as erroneous (5)

Ross

I believe the answer is:

erase

'delete' is the definition.
(I know that delete can be written as erase)

'some of the matter as erroneous' is the wordplay.
'some of' indicates a hidden word.
'ERASE' is hidden in the letters of 'the matter as erroneous'.

(Other definitions for erase that I've seen before include "Remove all traces of" , "Efface" , "Remove, wipe out" , "Put out of mind" , "Scratch" .)

I've seen this clue in The Irish Independent.
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