Corruptible, mercenary (5)
I believe the answer is:
venal
This clue is a double definition.
'corruptible' is the first definition.
(synonyms)
'mercenary' is the second definition.
(both can mean purely concerned with making money)
(Other definitions for venal that I've seen before include "Motivated by bribery" , "'Corrupt, open to bribery (5)'" , "Corruptible" , "Influenced by bribery, corrupt" , "Capable of being corrupted" .)