Apparel lackey brought up, enthrals visitor (6)
I believe the answer is:
caller
'visitor' is the definition.
(caller is a kind of visitor)
'apparel lackey brought up enthrals' is the wordplay.
'enthrals' indicates the answer is hidden within the clue (hidden letters are captured or enthralled).
'brought up' is a reversal indicator (in a down clue, letters go up).
'rellac' is hidden within 'apparel lackey'.
'rellac' backwards is 'CALLER'.
(Other definitions for caller that I've seen before include "Visitor" , "One paying a brief visit" , "One visits" , "Someone phoning" , "Person on the line" .)