Aioli ingredient (6)
'aioli ingredient' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for garlic that I've seen before include "Vegetable" , "Pungent edible bulb" , "Plant of the onion family" , "Food flavouring not favoured by vampires?" , "Pungent plant" .)
(Other definitions for egg yolk that I've seen before include "17 [CAKE] ingredient" , "Part of an ovum" , "Omelette ingredient" , "What soldiers are dipped into" .)