Keep going and spilling the salt (4)
I believe the answer is:
last
'keep going' is the definition.
(I've seen this in another clue)
'spilling the salt' is the wordplay.
'spilling' indicates anagramming the letters.
'salt' with letters rearranged gives 'LAST'.
'and' is the link.
(Other definitions for last that I've seen before include "End" , "stay at the back" , "Piece of cobbler's equipment" , "Final; keep going" , "Bringing up the rear" .)