Garlic mayo (5)
I believe the answer is:
aioli
'garlic mayo' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for aioli that I've seen before include "Sort of mayonnaise" , "Garlic 9" , "Garlicky mayonnaise" , "11 [SAUCE]" , "Mayonnaise seasoned with mayonnaise" .)