Take vital move to be loquacious (9)
I believe the answer is:
talkative
'be loquacious' is the definition.
(synonyms)
'take vital move' is the wordplay.
'move' indicates an anagram.
'take'+'vital'='takevital'
'takevital' anagrammed gives 'TALKATIVE'.
'to' acts as a link.
(Other definitions for talkative that I've seen before include "of many words" , "Chatty" , "Gabby" , "Wordy" , "Voluble" .)