Out to profit from what's asked for that model (2,3,4)
I believe the answer is:
on the make
'out to profit from what's asked for' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'model' is the wordplay.
I cannot quite see how this works, but
'model' could be 'make' (eg a make or model of car) and 'make' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'that' acts as a link.
Can you help me to learn more?
(Other definitions for on the make that I've seen before include "Hoping for profit" , "intent on profit" , "Intent on gain (colloq.)" , "Trying to get rich quick" , "Bent on self-advancement" .)