Determined to get a greater system (3-2)
I believe the answer is:
set-up
'system' is the definition.
(thesaurus)
'determined to get a greater' is the wordplay.
I cannot really see how this works, but
'determined' could be 'set' (similar in meaning) and 'set' is found within the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for set-up that I've seen before include "Arrangement" , "in which one is made victim" , "organisation" , "Organization" .)