Keep cooking liquid (5)
I believe the answer is:
stock
I believe this clue is a double definition.
'keep' is the first definition.
(I know that keep is a cloud computing)
'cooking liquid' is the second definition.
(liquid used when cooking)
(Other definitions for stock that I've seen before include "Bouillon" , "Supply; part of rifle" , "Goods in store" , "Neck garment" , "Merchandise - ancestry" .)