Passing fashion due finally to lose appeal (4)
I believe the answer is:
fade
'lose appeal' is the definition.
(as in fading affection)
'passing fashion due finally' is the wordplay.
'passing fashion' becomes 'fad' (I've seen this before).
'finally' says to take the final letters.
The final letter of 'due' is 'e'.
'fad'+'e'='FADE'
'to' acts as a link.
(Other definitions for fade that I've seen before include "Droop" , "Grow dimmer" , "Gradually disappear from view" , "Deaf (anag.)" , "Grow dim" .)