Precipitate down-payment (7)
I believe the answer is:
deposit
I believe this clue is a double definition.
'precipitate' is the first definition.
(I've seen this before)
'down-payment' is the second definition.
(I've seen this before)
(Other definitions for deposit that I've seen before include "Lodge money in bank account" , "Money in bank - part payment" , "Drop" , "fur, possibly" , "Part payment in advance to secure goods" .)