Decide to get puzzle out again (7)
I believe the answer is:
resolve
This clue is a triple definition!
'decide' is the first definition.
(resolving is a kind of deciding)
'to get' is the second definition.
(resolving is a kind of getting)
'puzzle out again' is the third definition.
('solve' can be a synonym for 'puzzle out' so perhaps 'resolve' is OK for 'puzzle out again')
(Other definitions for resolve that I've seen before include "Sort out (a problem)" , "Analyse" , "Fix" , "Find the solution (to)" , "break up" .)