Printer's perseverance keeping dot? (11)
I believe the answer is:
intersperse
'dot?' is the definition.
('intersperse' can be a synonym of 'dot')
'printer's perseverance keeping' is the wordplay.
'keeping' indicates a hidden word.
'INTERSPERSE' is hidden within 'printers perseverance'.
(Other definitions for intersperse that I've seen before include "Scatter between other things" , "Dot" , "Spread throughout" , "Scatter - enterprises (anag)" .)