Exclusive Sun article at last (4)
I believe the answer is:
sole
'exclusive' is the definition.
('sole' can be a synonym of 'exclusive')
'sun article at last' is the wordplay.
'sun' becomes 'sol' (I've seen this before**).
'at last' says to take the final letters.
The last letter of 'article' is 'e'.
'sol'+'e'='SOLE'
(Other definitions for sole that I've seen before include "Dover - -" , "A fish; part of shoe" , "O __ Mio (Neapolitan song)" , "piece of leather" , "Lone; part of foot" .)