... Sun accepts also end of naked model (8)
I believe the answer is:
standard
'model' is the definition.
(I've seen this before)
'sun accepts also end of naked' is the wordplay.
'sun' becomes 'star' (I've seen this before**).
'accepts' indicates putting letters inside.
'also' becomes 'and' (I've seen this before).
'end of' says to take the final letters.
The final letter of 'naked' is 'd'.
'star' going around 'and' is 'standar'.
'standar'+'d'='STANDARD'
(Other definitions for standard that I've seen before include "sort of lamp" , "Principle" , "Stock - basic - flag" , "banner" , "Normal, average" .)