Conjecture there’s attempt to make financial gain (9)
I believe the answer is:
speculate
I believe this is a double definition.
'conjecture' is the first definition.
(I know that conjecture can be written as speculate)
'attempt to make financial gain' is the second definition.
(as in financial speculation)
'there's' acts as a link.
(Other definitions for speculate that I've seen before include "Make conjectures" , "Buy in hope of profit, but with risk of loss" , "Bet; theorise" , "Conjecture, theorise" , "Consider" .)