Crossword Genius

Rejected plain ballpoints that created stains (5)

Ross

I believe the answer is:

blots

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'stains' is the definition.
(I know this)

'rejected plain ballpoints' is the wordplay.
'rejected' suggests deleting specific letters.
'ballpoints' with 'plain' taken away is 'BLOTS'.

'that created' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Another definition for blots that I've seen is " Stains, perhaps on copybook".)

I've seen this clue in The Irish Times.
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