Miss taken by empty custom-built wardrobe (6)
I believe the answer is:
closet
'custom-built wardrobe' is the definition.
'closet' can be an answer for 'wardrobe' (synonyms). I'm not certain of the 'custom-built' bit.
'miss taken by empty' is the wordplay.
'miss' becomes 'lose' (I've seen this in other clues).
'taken by' is an insertion indicator.
'empty' becomes 'ct' (I can't justify this - if you can you should give a lot more credence to this answer).
'lose' put inside 'ct' is 'CLOSET'.
Can you help me to learn more?
(Other definitions for closet that I've seen before include "Study" , "US press for clothing" , "Confine" , "A small room or cupboard" , "A small room - secret?" .)