Former model beginning to dance naked (7)
I believe the answer is:
exposed
'naked' is the definition.
(I've seen this before)
'former model beginning to dance' is the wordplay.
'former' becomes 'ex'.
'model' becomes 'pose' ('pose' can be a synonym of 'model'**).
'beginning to' suggests taking the first letters.
The first letter of 'dance' is 'd'.
'ex'+'pose'+'d'='EXPOSED'
(Other definitions for exposed that I've seen before include "Made public" , "at mercy of weather" , "Uncovered, visible" , "Deprived of protection" , "Showed up" .)