Get to grips to settle a deal (6)
I believe the answer is:
clinch
'get' is the definition.
(thesaurus)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for clinch that I've seen before include "seal" , "Fierce embrace" , "Settle conclusively, a deal say" , "make secure" , "Fasten securely or settle conclusively" .)