Shows the door to vacant juvenile taken in by eccentric sect (6)
I believe the answer is:
ejects
'shows the door' is the definition.
(to show someone the door is to eject or expel them)
'vacant juvenile taken in by eccentric sect' is the wordplay.
'vacant' says to hollow out the word (remove centre letters) (a vacant or emptied out form of the word).
'taken in by' is an insertion indicator (back).
'eccentric' indicates anagramming the letters.
'juvenile' with its middle removed is 'je'.
'sect' is an anagram of 'ects'.
'je' inserted into 'ects' is 'EJECTS'.
'to' is the link.
(Other definitions for ejects that I've seen before include "Throws out, of a building perhaps" , "Throws out forcibly" , "Expels, forces out" , "Casts out" , "Discharges" .)