Sweetens rolls, boundless pasta sauce (4)
I believe the answer is:
ragu
'pasta sauce' is the definition.
(I've seen this before)
'sweetens rolls boundless' is the wordplay.
'sweetens' becomes 'rag' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rolls' becomes 'clues' (cluing is a kind of rolling).
'boundless' indicates the central letters (the limits or bounds of the word are removed).
The centre of 'clues' is 'u'.
'rag'+'u'='RAGU'
Can you help me to learn more?
(Other definitions for ragu that I've seen before include "pasta sauce" , "tomato and meat sauce" .)