Clairvoyant is to support the nuts in charge (9)
I believe the answer is:
prophetic
'clairvoyant' is the definition.
('prophetic' can be similar in meaning to 'clairvoyant')
'support the nuts in charge' is the wordplay.
'support' becomes 'prop' (prop is a kind of support).
'nuts' is an anagram indicator (nuts can mean crazy).
'in charge' becomes 'ic'.
'the' anagrammed gives 'het'.
'prop'+'het'+'ic'='PROPHETIC'
'is to' is the link.
(Other definitions for prophetic that I've seen before include "Divinatory, prescient" , "divination" , "Oracular, predicting events" , "Seeing what's going to happen" , "Foreseeing future events" .)