Something filling skip that obviously doesn't get eaten, initially (6)
I believe the answer is:
stodge
'something filling' is the definition.
(filling food)
'skip that obviously doesn't get eaten initially' is the wordplay.
'initially' indicates taking the first letters.
The initial letters of 'skip that obviously doesnt get eaten' is 'STODGE'.
(Other definitions for stodge that I've seen before include "treacle pudding?" , "Heavy stuff" , "Sticky stuff" , "Heavy meal" , "Heavy, often starchy, food" .)