Oddly showy Asian uncle makes condiment (3,5)
I believe the answer is:
soy sauce
'condiment' is the definition.
(I know that soy sauce is a type of condiment)
'oddly showy asian uncle' is the wordplay.
'oddly' indicates alternate letters (letters in odd-numbered positions).
'showy'+'asian'+'uncle'='showyasianuncle'
The alternating letters of 'showyasianuncle' are 'SOY SAUCE'.
'makes' is the link.
(Other definitions for soy sauce that I've seen before include "addition to a meal" , "Condiment" , "Staple of eastern cooking" , "Eastern cooking ingredient" , "Ingredient in Chinese" .)