It's been made to go into action, unusually, again (8)
I believe the answer is:
creation
'it's been made to' is the definition.
I can't tell whether this defines the answer.
'into action unusually again' is the wordplay.
'into' indicates putting letters inside.
'unusually' is an anagram indicator.
'again' becomes 're' (prefix meaning 'again').
'action' anagrammed gives 'cation'.
'cation' going around 're' is 'CREATION'.
'go' is the link.
Can you help me to learn more?
(Other definitions for creation that I've seen before include "work" , "Beginning event" , "Puzzlingly" , "The making of something out of nothing" , "The universe, all things" .)