Fashion model ripped top on purpose (5)
I believe the answer is:
trend
'fashion' is the definition.
(I've seen this before)
'model ripped top on purpose' is the wordplay.
'model' becomes 't' (Ford Model T car).
'top' indicates taking the first letters.
'on' says to put letters next to each other.
'purpose' becomes 'end' (I've seen this before).
The first letter of 'ripped' is 'r'.
't'+'r'+'end'='TREND'
(Other definitions for trend that I've seen before include "Drift; vogue" , "be all over Twitter, Instagram, etc" , "Direction, tendency" , "Vogue, tendency" , "Mode" .)