Crossword Genius

On line to get ahead with something Spanish? (5)

Ross

I believe the answer is:

onion

I'm a little stuck... Click here to teach me more about this clue!

'something spanish?' is the definition.
I can't tell whether this definition defines the answer.

'on line to get ahead' is the wordplay.
'line' becomes 'oni' (I can't explain this - if you can you should believe this answer much more).
'to get ahead' says to put letters next to each other (some letters go ahead of others).
'on' put after 'oni' is 'ONION'.

'with' is the link.

Can you help me to learn more?

(Other definitions for onion that I've seen before include "Shape of Russian dome" , "Pungent vegetable" , "Aromatic flavourful versatile vegetable" , "Eye-watering vegetable" , "Plant with edible bulb" .)

I've seen this clue in the Evening Standard.
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