Crossword Genius

Pens producing plain blots (10)

Ross

I believe the answer is:

ballpoints

'pens' is the definition.
(ballpoint is a kind of pen)

'producing plain blots' is the wordplay.
'producing' indicates anagramming the letters.
'plain'+'blots'='plainblots'
'plainblots' is an anagram of 'BALLPOINTS'.

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