Continuing without interruption, bringing us in badly marked (9)
I believe the answer is:
sustained
'continuing without interruption' is the definition.
'sustained' can be an answer for 'continuing' (thesaurus). I'm not sure about the 'without interruption' bit.
'us in badly marked' is the wordplay.
'in' is an insertion indicator.
'badly marked' becomes 'stained' (I've seen this before. I am not sure about the 'badly' bit.).
'us' put within 'stained' is 'SUSTAINED'.
'bringing' acts as a link.
Can you help me to learn more?
(Other definitions for sustained that I've seen before include "Kept going, supported" , "held up" , "Kept (something) going" , "prolonged" , "Steadily maintained" .)