They’re possibly Spanish, si? No, no: wrong (6)

I believe the answer is:

onions

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'they're possibly spanish' is the definition.
The definition suggests an adverb but the answer is not.

'si? no no wrong' is the wordplay.
'wrong' is an anagram indicator.
'si'+'no'+'no'='sinono'
'sinono' is an anagram of 'ONIONS'.

Can you help me to learn more?

(Other definitions for onions that I've seen before include "Pungent, edible bulbs" , "nuts" , "Pungent bulbs (6)." , "English cricketer" , "Such may make one weep" .)

I've seen this clue in the Evening Standard.

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