Garlic mayonnaise made by girl about ten (5)
I believe the answer is:
aioli
'garlic mayonnaise' is the definition.
(aioli is a condiment)
'girl about ten' is the wordplay.
'girl' becomes 'Ali' (girl's name).
'about' is an insertion indicator.
'ten' becomes 'IO' (IO resembles 10).
'ali' going around 'io' is 'AIOLI'.
'made by' acts as a link.
(Other definitions for aioli that I've seen before include "Garnish" , "A lamb joint; driven clouds" , "Garlicky mayonnaise" , "Sort of mayonnaise" , "garlic dip" .)