Bra thinly disguised as a mind-boggling trap (9)
I believe the answer is:
labyrinth
'a mind-boggling trap' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'bra thinly disguised' is the wordplay.
'disguised' is an anagram indicator.
'bra'+'thinly'='brathinly'
'brathinly' with letters rearranged gives 'LABYRINTH'.
'as' is the link.
Can you help me to learn more?
(Other definitions for labyrinth that I've seen before include "hard to get out of" , "listening equipment" , "Maze-like structure" , "Maze, tangled network" , "puzzle -" .)