Maybe part of Sunday's dinner dance (6,6)
I believe the answer is:
mashed potato
'dinner dance' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'maybe part of sunday's' is the wordplay.
I cannot quite see how this works, but
'part' could be 'pot' (pot is a kind of part) and 'pot' is present in the answer.
'of' could be 'o' and 'o' is located in the answer.
'sunday' could be 's' and 's' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for mashed potato that I've seen before include "Accompaniment of bangers" , "veg" , "Dance (to go with bangers?)" .)