Vital (9)
'vital' is the definition.
(I know that vital can be written as important)
This is the entire clue.
(Other definitions for important that I've seen before include "A priority" , "Significant, valuable" , "of great concern" , "Noted" , "Meaningful" .)
'vital' is the definition.
(similar in meaning)
This is the entire clue.
(Other definitions for essential that I've seen before include "something necessary" , "So is certain oil-production" , "must-have item" , "organic" , "Key" .)
'vital' is the definition.
(key can mean important)
This is the entire clue.
(Other definitions for key that I've seen before include "One that locks" , "Vital" , "It can open" , "Lock opener; low island" , "Scale system for music" .)
'vital' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for alive that I've seen before include "surviving" , "Vital, vibrant" , "Spirited" , "Teeming (with)" , "Animated, on the ball" .)
'vital' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for needed that I've seen before include "Required something essential" , "Required; sounds like worked (dough)" , "Missing" , "Lacked something essential" , "'Lacked, required (6)'" .)
(Another definition for all-important that I've seen is " Essential, crucial".)