Posers seldom troubled (6)
I believe the answer is:
Here is my best explanation:
'posers' is the definition.
('model' can be a synonym of 'poser')
'seldom troubled' is the subsidiary indication.
'troubled' indicates an anagram.
'seldom' is an anagram of 'models'.
(Other definitions for models that I've seen before include "Seldom (anag)", "Prototypes", "Clothes exhibitionists for the catwalk", "Poses for artists", "Exemplars or mannequins", "Human clothes horses or protoypes", "Mannequins or examplars", "Representative forms or patterns" and "Clothes-horses".)