Criticise crash (4)
I believe the answer is:
I believe this is a double definition.
'criticise' is the first definition.
(I've seen this in another clue)
'crash' is the second definition.
(I've seen this before)
(Other definitions for slam that I've seen before include "Severely criticise; shut (a door) forcefully" , "Shut violently" , "Ambitious contract" , "Shut hard" , "Close noisily" .)