Old-fashioned fruit salad at last (5)
I believe the answer is:
dated
'old-fashioned' is the definition.
(thesaurus)
'fruit salad at last' is the wordplay.
'fruit' becomes 'date' (date is a kind of fruit**).
'at last' indicates one should take the final letters.
The last letter of 'salad' is 'd'.
'date'+'d'='DATED'
(Other definitions for dated that I've seen before include "No longer fashionable or current" , "Antiquated" , "not without romantic engagements" , "Went out with - old hat" , "out of the ark" .)