Dental work that is satisfying? (7)
I believe the answer is:
filling
'satisfying?' is the definition.
('fill' can be a synonym of 'satisfy')
'dental work' is the wordplay.
I cannot really understand how this works, but
'work' could be 'fill' (filling is a kind of working) and 'fill' is found within the answer.
This may be the basis of the clue (or it may be nonsense).
'that is' is the link.
Can you help me to learn more?
(Other definitions for filling that I've seen before include "Tooth insert" , "Requirement of teeth or petrol tank?" , "Finding someone for (a post)" , "Satisfying (meal); one given by dentist" , "Contents" .)