Gorge dinner a vineyard partly supplies (6)
I believe the answer is:
ravine
'gorge' is the definition.
(I've seen this before)
'dinner a vineyard partly supplies' is the wordplay.
'supplies' indicates the answer is hidden within the clue (I've seen 'supplying' mean this).
'RAVINE' is hidden in the letters of 'dinner a vineyard partly'.
(Other definitions for ravine that I've seen before include "Narrow, steep-sided valley" , "Defile" , "Steep-sided gorge" , "Deep narrow valley" , "'Deep, steep valley (6)'" .)