To earn, you have to produce! (4)
I believe the answer is:
make
I believe this is a triple definition!
'to earn' is the first definition.
(synonyms)
'you' is a link.
'have' is the second definition.
(synonyms)
'to' is a link.
'produce' is the third definition.
(synonyms)
(Other definitions for make that I've seen before include "Manufacture, form" , "Build" , "Construct, create" , "Appoint" , "Fabricate" .)