Get back from uncle’s (6)
I believe the answer is:
redeem
'get back' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for redeem that I've seen before include "rescue" , "Recover from the pawnshop" , "Ransom" , "Make good" , "Get back" .)