Both sides with chilli vinegar burn a little (4)

I believe the answer is:

char

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

'burn a little' is the definition.
'char' can be an answer for 'burn' (charring is a kind of burning). I'm unsure of the 'a little' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for char that I've seen before include "Scorch, small fish" , "Drink" , "One cleans" , "Scorch: trout-like fish" , "Fish < tea" .)

I've seen this clue in the Irish Times.

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