Disregard fashion model (6)
I believe the answer is:
forget
'disregard' is the definition.
(I've seen this in another clue)
'fashion model' is the wordplay.
'fashion' becomes 'forge' (synonyms).
'model' becomes 't' (Ford Model T car).
'forge'+'t'='FORGET'
(Other definitions for forget that I've seen before include "Stop remembering" , "Slip one's mind" , "Dismiss from the mind" , "Overlook" , "Neglect (to do)" .)