Tortilla, avocado, cheese, onion, all as starter? (4)
I believe the answer is:
taco
'tortilla' is the definition.
(I have seen 'Mexican tortilla ' mean 'taco' so perhaps 'tortilla' could also mean 'taco')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for taco that I've seen before include "Tortilla rolled round a filling" , "Tortilla with savoury filling" , "quick dish" , "Mexican dish of rolled tortilla with filling" , "Mexican filled tortilla" .)