It's got all the answers (3)
I believe the answer is:
key
'it's got all the answers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for key that I've seen before include "//www.crosswordgiant.com/crossword-clue/1252911/" , "Coral reef off southern coast of Florida" , "(3)" , "Essential; solution" , "One that locks" .)