Vital (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for important that I've seen before include "A priority" , "Significant, valuable" , "of great concern" , "Noted" , "Meaningful" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for essential that I've seen before include "something necessary" , "So is certain oil-production" , "must-have item" , "organic" , "Key" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(key can mean important)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for alive that I've seen before include "surviving" , "Vital, vibrant" , "Spirited" , "Teeming (with)" , "Animated, on the ball" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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".)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for crucial that I've seen before include "'Critical, vital (7)'" , "Pivotal" , "Urgent" , "All-important" , "Vitally important" .)