Capable of being corrupted; mercenary (5)
I believe the answer is:
venal
I believe this clue is a double definition.
'capable of being corrupted' is the first definition.
(I've seen this before)
'mercenary' is the second definition.
(both can mean purely concerned with making money)
(Other definitions for venal that I've seen before include "Easily corrupted" , "easily bribed" , "Corruptly mercenary" , "Capable of being corrupted" , "'Corrupt, open to bribery (5)'" .)