Concede top part of evening dress has been lost (3)
I believe the answer is:
own
'concede' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for own that I've seen before include "Be in legal possession of (3)" , "Acknowledge" , "Private" , "Possess - recognise - admit" , "Personal; possess" .)