Former model beginning to dance naked (7)
I believe the answer is:
Here is my best explanation:
'naked' is the definition.
'former model beginning to dance' is the subsidiary indication.
'former' becomes 'ex'.
'model' becomes 'pose' ('pose' can be a synonym of 'model').
'beginning to' says to take the initial letters.
The first letter of 'dance' is 'd'.
(Other definitions for exposed that I've seen before include "Unprotected from the weather", "Without protection", "Not covered", "Made public", "Open to view", "Unmasked, revealed", "Without cover", "Uncovered, visible", "Brought to light" and "Not hidden".)